YouTube shooting: Female suspect dead, three wounded at firm's HQ in San Bruno, California

A woman opened fire at YouTube's California headquarters Tuesday afternoon before turning the gun on herself, authorities said. Three other people were shot, one of whom was in critical condition.

Four senior law enforcement officials identified the woman as Nasim Najafi Aghdam, 39, whose last known address is in the San Diego area. They said she used a 9mm handgun.

Law enforcement officials said the woman approached an outdoor patio and dining area near lunchtime and opened fire in what appeared to be a domestic dispute not related to terrorism.

Zach Voorhies, a YouTube software engineer, said in an interview on MSNBC's "Hardball" that he heard yelling and that "when I arrived near the courtyard, I heard somebody yelling, 'Do you want to shoot me?'"

"I looked to my left, which was his left, and I saw somebody lying on their back on the concrete with what appeared to be a gunshot wound through the stomach," Voorhies said.

Zuckerberg San Francisco General Hospital said it received three patients with gunshot wounds: a 36-year-old man who was in critical condition, a 32-year-old woman who was in serious condition and a 27-year-old woman who was in fair condition. A fourth person was treated at Kaiser Permanente South San Francisco Medical Center for a broken ankle, the hospital said.

31 PHOTOS
Shooting at YouTube headquarters in San Bruno, California
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Shooting at YouTube headquarters in San Bruno, California
YouTube employees are seen walking away from Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
Yellow tarp seen at YouTube HQ as police continue searching for shooter (@KTVU) https://t.co/bwTLj8Ewgf
A police officer and crime scene markers are seen at Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
SAN BRUNO, CA - APRIL 03: Police walk outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police walk outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, UNITED STATES - APRIL 3: Security measures are taken after security forces responded to an active shooter at YouTube's California headquarters in San Bruno, California, United States on April 3, 2018. A woman shot and wounded at least four people before possibly taking her own life at YouTube's California headquarters Tuesday, according to police. (Photo by Yichuan Cao/Anadolu Agency/Getty Images)
Police officers are seen at Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
SAN BRUNO, CA - APRIL 03: Police officers stand by in front of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police officers stand by in front of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police officers stand by in front of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police in tactical gear walk outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. A woman opened fire at the facility, wounding four people before taking her own life, according to authorities. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police in tactical gear walk outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. A woman opened fire at the facility, wounding four people before taking her own life, according to authorities. (Photo by Justin Sullivan/Getty Images)
We are seeing @YouTube employees being brought out with hands up! https://t.co/ZlSMY9FIVm
SAN BRUNO, CA - APRIL 03: Police look on as employees walk across the streer outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. A woman opened fire at the facility, wounding four people before taking her own life, according to authorities. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Law enforcement stands watch outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
Media gather outside during an active shooting at YouTube's offices in San Bruno, California on April 3, 2018. Gunshots erupted at YouTube's offices in California Tuesday, sparking a panicked escape by employees and a massive police response.Some media reports said several people were injured. San Bruno police warned on Twitter to stay away from the area housing the headquarters of the Google-owned video sharing service near San Francisco. / AFP PHOTO / Josh Edelson (Photo credit should read JOSH EDELSON/AFP/Getty Images)
The offices of YouTube are seen in the distance outside after an active shooting at YouTube's offices in San Bruno, California on April 3, 2018. Gunshots erupted at YouTube's offices in California Tuesday, sparking a panicked escape by employees and a massive police response, before the shooter -- a woman -- apparently committed suicide.Police said three people had been hospitalized with gunshot injuries following the shooting in the city of San Bruno, and that a female suspect was found dead at the scene. 'We have one subject who is deceased inside the building with a self-inflicted wound,' San Bruno Police Chief Ed Barberini told reporters. 'At this time, we believe it to be the shooter.' / AFP PHOTO / Hand-Out / Josh Edelson (Photo credit should read JOSH EDELSON/AFP/Getty Images)
SAN BRUNO, CA - APRIL 03: Law enforcement stands watch outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, UNITED STATES - APRIL 3: Security measures are taken after police officers responded to an active shooter at YouTube's California headquarters in San Bruno, California, United States on April 3, 2018. The San Bruno Police Department urged people to stay away from the building, located at Cherry Ave and Bay Hill Drive. (Photo by Yichuan Cao/Anadolu Agency/Getty Images)
SAN BRUNO, UNITED STATES - APRIL 3: Security measures are taken after police officers responded to an active shooter at YouTube's California headquarters in San Bruno, California, United States on April 3, 2018. The San Bruno Police Department urged people to stay away from the building, located at Cherry Ave and Bay Hill Drive. (Photo by Yichuan Cao/Anadolu Agency/Getty Images)
SAN BRUNO, CA - APRIL 03: Police walk outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: San Bruno police chief Ed Barberini speaks to members of the media outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: Police survey the scene outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03: San Bruno police chief Ed Barberini speaks to members of the media outside of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded. (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, UNITED STATES - APRIL 3: Security measures are taken after police officers responded to an active shooter at YouTube's California headquarters in San Bruno, California, United States on April 3, 2018. The San Bruno Police Department urged people to stay away from the building, located at Cherry Ave and Bay Hill Drive. (Photo by Yichuan Cao/Anadolu Agency/Getty Images)
San Mateo County SWAT team officers are seen near Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
Law enforcement officers are seen near a patio with crime scene markers at Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
Burlingame police chief Eric Wollman pets Kimba while bringing him to his owner following an active shooter situation at Youtube headquarters in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
A fire engine is seen outside Youtube headquarters following an active shooter situation in San Bruno, California, U.S., April 3, 2018. REUTERS/Elijah Nouvelage
Burlingame police chief Eric Wollman hands off Kimba to his owner following an active shooter situation at Youtube headquarters in San Bruno, California, U.S., April 3, 2018. According to his owner, Kimba was present when the shooting occurred. REUTERS/Elijah Nouvelage
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"Once again, we are confronted with the specter of a mass-casualty situation here in the city and county of San Francisco," Andre Campbell, a trauma surgeon at Zuckerberg, told reporters. "This is unfortunate, and it continues. You'd think that after we've seen Las VegasParkland, the Pulse nightclub shooting that we would see an end to this, but we have not."

San Bruno Police Chief Ed Barberini said the shooter was believed to have killed herself.

"It was very chaotic, as you can imagine," he said.

Earlier, YouTube employees tweeted that they had evacuated the building in San Bruno, south of San Francisco, or were in hiding.

Barberini said San Bruno police began receiving multiple 911 calls of an "active shooter" at 12:46 p.m. (3:46 p.m. ET) and were on the scene within two minutes. The federal Bureau of Alcohol, Tobacco, Firearms and Explosives and the FBI said they also responded to the scene.

"I can tell you there is no immediate threat to the community," Barberini said later.

Ricardo Luis Horna, 29, a development specialist for YouTube, said he saw his colleagues running and falling down a hill as security officers told everyone to evacuate.

"There was chaos in the parking lot," Horna said in an interview. "People were running to their cars."

Marco Tartaglia, who works at Walmart eCommerce headquarters near the complex on Cherry Street, told NBC Bay Area that he heard about 15 shots "from the direction of the YouTube building, from what sounded like inside."

"We heard the shots first, and that immediately drew us over to the window to see what the heck's going on, and next thing you know, you see people streaming out, just running, dozens of them, just running out the front exit," Tartaglia said.

YouTube executives said they were shocked. "Today, it feels like the entire community of YouTube, and all of the employees, were victims of this crime," said Chris Dale, YouTube's head of communications.

Sundar Pichai, chief executive of Google LLC, YouTube's parent company, said in a brief statement on Twitter: "There are no words to describe the tragedy that occurred today."

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Reaction to the shooting at YouTube headquarters in San Bruno, California
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Reaction to the shooting at YouTube headquarters in San Bruno, California

**Click through the follow slides to see how people have reacted to the shooting at YouTube headquarters in San Bruno, Califonira.**

(Photo by Justin Sullivan/Getty Images)

There are no words to describe the tragedy that occurred today. @SusanWojcicki & I are focused on supporting our em… https://t.co/bRB4hzitot
There are no words to describe how horrible it was to have an active shooter @YouTube today. Our deepest gratitude… https://t.co/uZIZ857v8B
Horrible and truly tragic day for YouTube and Google. We are wishing all our very best for the injured and all those affected.
Was just briefed on the shooting at YouTube’s HQ in San Bruno, California. Our thoughts and prayers are with everyb… https://t.co/9gGGgoGDUv
Praying for the injured & their families. Grateful to ATF and all law enforcement & first responders who responded… https://t.co/EcSKyiY7Cw
We can’t keep being reactive to this, thinking and praying it won’t happen again at our schools, jobs, or our commu… https://t.co/zb8z276eIG
From everyone at Apple, we send our sympathy and support to the team at YouTube and Google, especially the victims and their families.
Here is the note that @sundarpichai just sent to Googlers worldwide. https://t.co/bdC6KeTl9c
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Other prominent technology company executives, including Tim Cook, chief executive of Apple Inc., and Jeff Bezos, chief executive of Amazon.com Inc., quickly expressed their sympathies.

President Donald Trump was briefed on the incident, he said on Twitter.

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