A Southwest Airlines flight from San Diego was forced to land after engine trouble Wednesday evening, a spokesperson for Lindbergh Field confirmed.

Southwest Flight 4451 heading to Tulsa International Airport in Tulsa, Oklahoma took off at 5:05 p.m.

According to the spokesperson, the pilot noticed trouble in one of the engines on the plane.

The flight landed safely around 5:50 p.m. 

There were no injuries, the spokesperson said.

At this point, it is unknown what caused the engine trouble.

No other information was immediately available.

Check back for updates on this breaking news story. 

The controversial Milo Yiannopoulos' speech at University of California, Berkeley met an early demise Wednesday as protesters grew violent — breaking fences and windows, setting off fireworks, and throwing smoke bombs — forcing police to issue an order to shelter in place and put all campus buildings on lockdown.

Invited by the Berkeley Republican Club, Yiannopoulos, a polarizing editor from Breitbart News who has been criticized as racist, misogynist and white supremacist, was expected to appear in the Pauley Ballroom of the MLK Student Union at 7 p.m.

Instead, university officials tweeted around 6:20 p.m. that the event had been cancelled and Yiannopoulos, a self-proclaimed internet troll, had been escorted off campus.

A group of protesters dressed in black and some in hooded sweatshirts broke windows, flung flares, and set a large bonfire outside the student union building.

Hundreds of peaceful demonstrators carrying signs that read "Hate Speech Is Not Free Speech" had been protesting for hours before the event.

Some even yanked away metal barricades as police in riot gear guarded the building.

Taking to Facebook soon after being escorted from UC Berkeley, Yiannopoulos said, "I have been evacuated from the UC Berkeley campus after violent left-wing protestors tore down barricades, lit fires, threw rocks and Roman candles at the windows and breached the ground floor of the building."

The 32-year-old said he and his team members were safe, and promised followers more information as it became available.

"One thing we do know for sure: the Left is absolutely terrified of free speech and will do literally anything to shut it down," he said.

Yiannapoulos continued: "Hearing reports via my security that police are using non-lethal bullets and tear gas outside. Fireworks, rocks and other projectiles have been hurled at police."

Leading up to his visit, Yiannopoulos has raised an issue facing campuses across America at the dawn of the Trump presidency: What is the line between free speech and hate speech?

He has also come under fire for fanning the flames of white supremacy by creating the Yiannopoulos Privilege Grant, which is being described as a college grant program for white males.

On Wednesday, UC Berkeley officials stressed that they did not invite Yiannopoulos, a right-wing provocateur who is gay and calls his event "The Dangerous Faggot Tour."

The potential for physical danger in reaction to Yiannopoulos came into the spotlight this month after a man was shot and wounded at a protest outside his Jan. 21 University of Washington talk.

Similarly rowdy protests at UC Davis Jan. 13 prompted campus Republicans to cancel his appearance at the last minute.

On Tuesday night at California Polytechnic State University in San Luis Obispo, his speech was met with dozens of angry protesters outside a campus theater, but they were outnumbered by police who kept them far from the nearly 500 attendees and the event went on as planned.

His last stop was supposed to be UCLA on Feb. 2, but that invitation was rescinded, making Berkeley the grand finale of his cross-country campus tour.

Student Matt Ronnau acknowledged Wednesday evening that he was not too popular. 

“He brings up topics that are not politically correct,” the Berkeley College Republican member said of Yiannopoulos. However, the student stands by the group’s decision to invite him to speak on campus.

“I don’t think it is hate speech,” Ronnau said. “I think he is just making fun of people who call him a neo-Nazi. It’s just a little back and forth.”

But protest organizer Ronald Cruz disagreed. Students would oppose the right-wing Yiannopoulos not because they don’t believe in free speech, but because they were trying to prevent his hateful rhetoric.

“He’s a neo-facist who has notoriously fostered a lynch mob mentality in his audiences,” Cruz alleged.

Professors had joined hundreds of students calling for the event's cancellation. But university officials said it would be allowed in the name of free speech — as would protests that Berkeley Chancellor Nicholas Dirks expected could be "substantial" amid tight security.

"In our view, Mr. Yiannopoulos is a troll and provocateur who uses odious behavior in part to 'entertain,' but also to deflect any serious engagement with ideas," Dirks wrote last week to Berkeley's staff and 37,500 students. "He has been widely and rightly condemned for engaging in hate speech."

But as a public university, Berkeley's administrators are legally bound by the First Amendment to protect free speech, meaning even offensive and hate speech cannot be banned or censored, Dirks said.

"We are defending the right to free expression at an historic moment for our nation, when this right is once again of paramount importance," Dirks said.

His letter did not name President Donald Trump, whom Yiannopoulos supports, but highlighted concerns at Berkeley and elsewhere since his election.

The Berkeley Republican Club said it has no plans to cancel the event because that would send a message that intimidation and violence can win. 

"We don't support everything he's said or done," said Pieter Sittler, 19, a sophomore who is the club's vice president. "But we think it's important to have a complete political discourse. Not just stay in an echo chamber and silence what you disagree with."

The event's 500 seats sold out about 48 hours after the event was announced last fall, Sittler said.

Yiannopoulos "gives a voice to repressed conservative thought on American college campuses," Sittler said, adding that he uses "levity and humor" that should not be taken literally.

Administrators say the demands to stifle Yiannopoulos show that modern sensitivities are changing the debate about free speech on campus. What used to be a campaign to allow all voices risks becoming more restrictive.

"This particular performer, his preference, his perspectives do conflict with this university, but that doesn’t mean we are going to abandon our commitment to free speech," said Assistant Vice Chancellor of Public Affairs Dan Mogulof.

That said, security will be tight on campus. 

Yiannopoulos also complained on Facebook that UC Berkeley was requiring campus Republicans to pay a security fee for the event. But Dirks insisted that the university typically requires event organizers to pay for basic security — a sum that totals up to $10,000.

Berkeley College Republicans will not be responsible for the added costs of security for protests, which Dirks said the campus would pay. He noted that officials would “not stand idly by” while laws are violated, no matter who the perpetrators are.

"People are very worried that it is going to get violent and no one wants to see that here," said Rigel Robinson with the Senator Student Association.

The number of attempts to keep speakers off college campuses because of their politics doubled last year, according to a report issued late last year by the Foundation for Individual Rights in Education. It logged a record 42 incidents of "disinvitations," with 25 percent aimed at Yiannopoulos.

"The increasing unwillingness to allow anyone on campus to hear ideas with which one disagrees poses a grave risk to students' intellectual development," Ari Cohn, director of the foundation's Individual Rights Defense Program, said in a statement.

Administrators have received hundreds of letters and emails calling for the event's cancellation.

There's a "No Milo" at Berkeley Facebook page with more than 3,500 people signed on, calling for a "mass counter protest" to shut down the event.

Nearly 100 professors signed a letter to the chancellor urging him to cancel the event. It cited some of Yiannopoulos' earlier comments.

At the University of Delaware, Yiannopoulos referred to transgender people as "mentally ill" and encouraged his audience to mock them.

He has called Black Lives Matter a form of "black supremacism." Twitter banned him in July, as it cracked down on racist abuse targeting "Ghostbusters" actress Leslie Jones.

At Western Carolina University he called feminism, "a mean, vindictive, spiteful, nasty, man-hating philosophy."

"The university should not provide a platform for such harassment," the letter from professors said. "We support robust debate, but we cannot abide by harassment, slander, defamation and hate speech."

Yiannopoulos rejects accusations he is racist or white supremacist, saying his boyfriend is black and his humor is taken too literally in today's politically correct culture.

A group of veterans from Berkeley's 1960s Free Speech Movement, however, praised university administrators for allowing the event.

"Even the worst kind of bigot, including Yiannopoulos, must be allowed to speak on campus," they wrote in an op-ed published by Berkeley's The Daily Californian.

A San Diego couple's dream of adopting their first child and starting a family was shattered when they learned the adoption agency they selected filed for bankruptcy. 

Jason Arrone and Kunal Ghose have been working since last may to adopt a child. 

The couple paid $15,000 to the non-profit Independent Adoption Center, based in Los Angeles. 

"The idea of it (the process) just stopping and not only did we, literally, lose all of our money, but having to start the whole process all over," said Jason Arrone.

They have been anxiously waiting, hoping, to find a potential birth mother. 

"I'm just absolutely devastated, just dumbfounded and blindsided from what happened," said Arrone.

But their dreams were abruptly put on hold in an email sent to them Tuesday. It was a blunt message: the Independent Adoption Center is closed, and declaring Chapter 7 bankruptcy. 

"We were kind of excited, moving forward, and then literally out of left field, even from what I can tell, the people who work there had no idea it was gonna happen until right before we were told," said Arrone.

The news stunned the couple. They have printed out fliers, information about themselves, to be sent to potential birth mothers. 

"My first reaction was anger, and I'm still angry and need assurances," said Kunal Ghose. "What happened?"

The couple said there was no indication that this was coming. 

"There was no sign of anything going wrong. The only thing that looked off was they were signing more couples than they were having actual adoptions," Ghose said.

A letter to clients noted "societal changes have created an environment where there are fewer potential birth parents." The letter makes no mention of any financial trouble. It says clients can file a claim if they feel they are owed money.

"It was almost insulting, like the idea, as if you 'thought' we were owed money. You have all of our money. It was just absurd," said Arrone.

The couple is still looking at their legal options and where to go next. They say that, based on a Facebook support page, some 700 people have been impacted by the closure, including at least 20 couples here in San Diego.

A child, described to be between 4 to 5-years-old, was hit by a car in Oceanside Wednesday night and airlifted to Rady Children's Hospital.

According to the Oceanside Police Department, the incident occurred around 7:56 p.m. on the 200 block of S Coast Highway. 

The child was bleeding from the face and suffered minor lacerations but was reported to be conscious and breathing. 

The driver did stay on the scene.

No other information was immediately available.

The Chargers ended their lease with the city of San Diego for both Qualcomm Stadium and Chargers Park on Wednesday by paying the city an early termination fee of $12.575 million dollars.

The Chargers have until July 31, 2017 to vacate the premises of Chargers Park.

The team plans to use a temporary headquarters in Costa Mesa before playing the coming 2017-18 NFL season at the StubHub Center, which currently serves as the Major League Soccer home of the Los Angeles Galaxy.

The early termination notice was expected when the team announced it was moving to Los Angeles in early January.

February 1st was the earliest the Chargers could officially end their lease agreement after announcing their relocation.

Some San Diego businesses are being impacted as tensions between Mexico and President Donald Trump's administration continue to rise over talks of a border wall and an increased tax on imports from Mexico.

According to the San Diego Regional Economic Development Corporation (EDC), Mexico is the third larged trading partner for the U.S.

In 2015, California exported nearly $27 billion worth of goods to Mexico.

NBC 7 spoke to some business owners in San Ysidro on Wednesday who said a boycott with Mexico would be devastating for their business.

At JSD, there are far less customers than normal, manager Bertha Fridman said.

"Last year we had tons of people and now they are afraid just to come," Fridman told NBC 7.

Everard Meade, with the Trans Border Institute said he believes the tensions could cause Mexico to retaliate.

"It's a competitive global environment and we are always balancing several forces off of each other. It's not a zero-sum game," Meade said.

Some of the major businesses that could be impacted include shipping, tech and auto. In San Diego, the trucking business sees about 800,000 trucks entering through Otay Mesa.

"There are 23 states in the United States that send a majority of their exports to Mexico," Meade said. "We are absolutely dependent on that relationship and if Mexico retaliates and starts putting on import duties, that is going to affect foremost American small and medium size businesses."

For Fridman, if businesses does not pick up again, it could affect their staffing.

"This is the first time that we are just thinking that we have to cut hours and we don't want to because we have employees for many many years," Fridman said.

The Chamber of Commerce told NBC 7 there was a threat of a strike from Tijuana that has seen been pacified.

Call it Facebook Fatigue. People are simply getting fed up with all the political posts that are showing up on their Facebook page.

Lisa Whitlock says she doesn't mind talking politics to people face-to-face but she is appalled by the social media fighting, insults and name calling on Facebook.

"I feel like I'm on reality TV, this is ridiculous," says Whitlock.

Lori Cellucci supported President Trump but wishes people would tone down the discussion on both sides.

"I would like Facebook to be less combative," said Cellucci.

Psychologist Walt Cieko says people will say things online they would never say to someone in person.

"I think there are some people who think they have superior knowledge and they just have to get it out to those with inferior knowledge," said Cieko.  

But those comments have repercussions like nasty replies and unfriending, both online and in real life.

People in San Diego tell me they've unfriended family members.  One couple said they canceled a trip with another couple over their postings on Facebook.

Rachel Whitlock wishes for the old days, "Please start posting kid pictures and vacation pictures and dog pictures, I don't even care."

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An unwelcome Milo Yiannopoulos whipped UC Berkeley students into a frenzy on Wednesday, triggering violent protests and forcing officials to cancel his speech and lock down the campus. 

The polarizing Breitbart technology editor took to Facebook Live a short while after being evacuated alongside his team, and said that it was "ironic and sad" to witness such a reaction at a university that has historically been known as the home of free speech.

"Something very disturbing happened tonight, and it was an expression of political violence in response to a not particularly conservative gay speaker on an American college campus," said Yiannpoulos, who admitted to being "stunned" by the turn of events.

The 32-year-old has been criticized as a racist, sexist, misogynist and white supremacist, but denied all those allegations on Facebook Live. "They do that in order to legitimize their own violence against you," he said.

In this case, "they" in broad brushstrokes includes feminists, supporters of Black Lives Matter, progressives and the "social justice left," according to Yiannapoulos. People who identify with these groups have "become so utterly antithetical to free speech," he accused.

"They simply will not allow any speaker on campus even someone as silly and harmless and gay as me to have their voice heard," Yiannopoulos continued with a self-deprecating chuckle. "They're absolutely petrified by alternative visions of how the world ought to look." 

Yiannopoulos was invited by the Berkeley Republican Club to speak about cultural appropriation in the Pauley Ballroom of the MLK Student Union at 8 p.m. Nearly two hours prior, though, protesters grew violent, smashing windows, throwing rocks, lighting fireworks and blazes, and tearing down barricades near the venue. He was promptly taken off campus and police ordered students to shelter in place. 

Yiannopoulos also didn't spare UC Berkeley officials and responding police officers.

"Complicit" school administrators "didn’t really want" his event to happen, and officers displayed a "sit back, and let it happen approach," he claimed.

Yiannopoulos said that he had hoped that UC Berkeley "would be a place where you could be, do and say anything. You could express your views, you could express your opinions, you know, crack some jokes, make people think, make people laugh, free from violent responses to political ideas."

"I thought America was the one place where that would be possible," he lamented.

More than one million people in San Diego County struggle to make a living, according to a report released by the Center on Policy Initiatives.

The report states that the income for 33 percent of working age families in San Diego is not enough to cover basic living expenses, calculated to be approximately $28,000 for a single adult.

As the size of the family grows, the cost of living rises but the income usually stays the same.

According to the report, Latino and Blacks living in San Diego County tended to fall short on living expenses, with Latinos more than twice as likely to have incomes below the poverty line compared to White families.

The report also found that women earned 74 cents for every dollar that men earn in the county, across all industries. The gender pay gap was also larger in tourism and service industries.

But in construction, women usually earned more than men, although the industry employed more males.

You can view the full report here.

Australia's prime minister insisted Thursday that a deal struck with the Obama administration that would allow mostly Muslim refugees rejected by Australia to be resettled in the United States was still on, despite President Donald Trump dubbing the agreement "dumb" and vowing to review it, NBC News reported.

Prime Minister Malcolm Turnbull declined to comment on his first telephone call with Trump as national leaders. 

"It's better that these things — these conversations — are conducted candidly, frankly, privately," Turnbull told reporters. Later, however, he denied during an interview with Sydney radio station 2GB that President Trump had hung up on him, saying the conversation had ended "courteously." Turnball added: "I can assure you the relationship is very strong. 

Yet shortly after Turnbull made those comments to reporters, Trump took to Twitter to slam the deal. "Do you believe it?" the president wrote. "The Obama Administration agreed to take thousands of illegal immigrants from Australia. Why? I will study this dumb deal!"

A group of Yemeni business owners plan to shut down their delis, grocery stores and bodegas across New York City in protest of President Donald Trump's travel ban on people hailing from seven Muslim-majority countries, including Yemen.

The mass closing will take place from noon until 8 p.m. Thursday.

Organizers say hundreds of the stores around the city are expected to take part to show how much they're a part of the fabric of New York City.

They say several thousand of the neighborhood stores are owned by Yemenis. 

After the bodega shutdown, organizers plan to hold a rally at Brooklyn Borough Hall Thursday evening. 

Trump's executive order barring people hailing from Yemen, Iraq, Iran, Libya, Somalia, Sudan and Syria for 90 days has resulted in travelers being detained or sent back from the United States as well as stranded in other countries.

Business owner Adnan Alshabbi plans to close his bodega in the Morrisania section of the Bronx on Thursday. 

“We have to fight, we have to stand up,” Alshabbi said.

Ongoing protests over President Trump's policies continued in lower Manhattan Wednesday night. Earlier in the evening, thousands of people protested outside of Sen. Chuck Schumer's apartment in Brooklyn, demanding he do more to oppose the president's actions. 

President Donald Trump is scheduled to speak Thursday morning at the National Prayer Breakfast in Washington.

Religious conservatives who helped propel Trump to the White House are watching closely for him to deliver on promised protections for religious objectors to gay marriage and abortion.

Donald Trump's promise to build a wall between the border of the United States and Mexico is just one option when it comes to border security, NBC News reported.

Around the world, physical barriers aren't the only things countries are doing to keep people out. Border agencies in conjunction with security companies are developing technology, such as "intelligent fences" that can detect intruders. Other options include ground sensors and high-range security camera that can see up to 15 miles away. Sniffer dogs are also being used.

In Europe especially, maritime surveillance is a large share of the market as well, driven by demand for unarmed drones, helicopters and patrol vessels to keep track of the number migrants crossing the Mediterranean Sea. Rather than aggressive tactics, countries are using equipment that is security based.

An Escondido man has been booked on a first-degree murder charge in connection with the death of his mother.

Escondido police officers were called to a home on North Hickory Street, between E Washington Avenue and Valley Parkway just before 7 p.m. Wednesday.

Rebecca Apodaca, 55, was found dead with injuries investigators described as consistent with a homicide.

Escondido police identified the suspect as 25-year-old David McGee.

McGee is accused of killing his mother and then trying to hurt himself, police said.

Emergency responders took McGee to a nearby hospital with non-life threatening injuries.

Detectives have not released information about what weapon – if any - was used in the killing.

An unknown number of civilians, including children, were killed during a U.S. military operation targeting al Qaeda militants this week, NBC News reported. One Navy SEAL also died during the operation in Yemen.

The Defense Department identified the Navy SEAL as Chief Petty Officer William "Ryan" Owens.

Nawar al-Awlaki, the daughter of an American-born al Qaeda leader, Anwar al-Awlaki, was among those killed.

Her father, an American citizen, was killed in a drone strike in 2011. The military said in a statement that it is still trying to determine the number of civilian casualties during the "ferocious" gunfight. Fourteen militants were also killed.

San Diego-based Pacifica Enterprises has broken ground on a long-anticipated, $11 million renovation and restoration of the historic Plunge swimming pool at Belmont Park in Mission Beach.

A statement from the developer, which operates Belmont Park under a lease agreement with the city of San Diego, said the facility is scheduled to reopen in 2019, after being closed for the past several months. The Plunge was among Belmont Park’s original attractions when the park opened in 1925 but has fallen into disrepair over the years.

The renovation was kicked off with a recent public ceremony at the Mission Beach site. Pacifica Enterprises will complete a restoration of the historic swimming pool and the building that surrounds it. There will also be a new state-of-the-art fitness center operated by Fit Athletic Club.

Developers said the new building will have a glass retractable roof system, geared to promoting natural air circulation, and will incorporate some of the park’s current Spanish Renaissance architectural features.

The project’s general contractor is Lusardi Construction Co. of San Marcos, which began demolition of the old Plunge building in mid-January. The designer of the Fit Athletic Club is San Diego-based Jules Wilson Interior Design, which has also worked on Fit locations that opened previously in East Village and Solana Beach, according to a statement from the design firm.

Pacifica Enterprises acquired the lease to Belmont Park in 2012. The renovation of the Plunge is being done through a public-private partnership in which the developer will advance $5.2 million for the renovation of the city-owned property. The company will recoup its investment through rent credits over the next seven to 10 years.

Identity fraud hit a record 15.4 million Americans last year, NBC News reported. The number is up 16 percent from 2015, according to a study from Javelin Strategy and Research.

Despite widespread efforts to fight identity theft, crooks successfully netted two million more victims and stole $16 billion.  

"Criminals are getting much better at committing fraud online," said Al Pascual, research director and head of fraud and security at Javelin Strategy & Research. "Their skill sets are improving and the tools that they're using are much more sophisticated."

Dozens of Yorkie and Yorkie mix-breed dogs rescued from a home in Poway are now available for adoption, the San Diego Humane Society announced Thursday.

Applications will be accepted for more than 80 of the dogs that are ready to be placed in new homes.

Volunteers and staff with the SDHS have evaluated the dogs. The animals have been spayed/neutered, vaccinated, microchipped and groomed, the organization said. Some dogs received dental care.

Anyone interested can submit an application through noon Saturday, Feb. 4. After the applications have been reviewed, there will be a lottery of those approved by SDHS staff.

The agency said they will contact each family individually to set up an appointment so as to not overwhelm the dogs.

On January 20, animal service workers seized 92 Yorkshire terriers and Yorkshire terrier mix breed dogs from a home in Poway.

Officials said the owners, an elderly couple, sought out help for the animals that were living in overcrowded, unsanitary conditions. 

Four days later, an additional 29 Yorkie mix-breed dogs were found at the same home.

Three members of a San Diego family died in a head-on collision Wednesday in Lemon Grove. Two other family members were hospitalized with injuries.

One of the victims has been identified by a relative as 18-year-old Lizbeth Soto.

Family members and friends are also mourning the loss of a 7-year-old girl and a 12-year-old boy.

A 20-year-old woman was hospitalized at Scripps Hillcrest while a 4-year-old girl was at Rady Children's Hospital.

The five victims were traveling in a black Acura as it made a left turn from Lemon Grove Avenue onto Massachusetts Avenue around 4 p.m. Wednesday.

The Acura collided with a gray SUV that was traveling south on Lemon Grove Avenue.

Deputies said the impact severely damaged the Acura and first responders used the jaws of life to extricate the victims.

Stan Harding was among the people who tried to help the victims after the crash. He said he got one passenger and a little girl out of a vehicle but the others were pinned inside.

"I stood right here and tears just came to my eyes," Harding said.

Four dogs inside the Acura also died in the collision, officials said.

Investigators spent hours at the crash scene. Alcohol or drugs don't appear to be a factor, they said.

Initially deputies said they believed one of the drivers may have run a red light.

Watch NBC 7 News at 4 p.m. for more on the investigation into this crash.