A woman shot and wounded three people at YouTube’s headquarters in Northern California before killing herself, police say.

YouTube shooting

US media have named the suspect as Nasim Aghdam and said the incident is the result of a domestic dispute.

A 36-year-old man left in a critical condition is believed to be her boyfriend, CBS news reports. Two women, 32 and 27, were also shot.

But police are yet to comment on the motivation for the shooting.

Such “active shooter” incidents are overwhelmingly carried out by men – an FBI report found that out of 160 incidents between 2000-2013 only six of the people who opened fire were women.

What happened?

The suspect is reported to have approached an outdoor patio and dining area at the offices in San Bruno, near San Francisco, at about lunchtime and opened fire with a handgun.

San Bruno Police Chief Ed Barberini said officers arrived at the offices at 12:48 (19:48 GMT) local time to find a “chaotic scene”, with numerous people fleeing.

Images broadcast on local TV stations showed employees leaving with their hands raised. Other footage showed evacuees forming a queue before being individually frisked by police.

One person with a bullet wound was found at the front of the company headquarters, Mr Barberini said. Minutes later officers found a woman who appeared to have shot herself, he said.

Two further victims were later discovered at an adjacent business.

An employee at a nearby fast food restaurant told Fox station KTVU he had treated a young woman who suffered a bullet wound to the leg.

He said he had fashioned a makeshift tourniquet from a bungee cord as they waited for first responders.

Several YouTube employees tweeted about the attack as it was taking place.

Product manager Todd Sherman said people fled the building in panic as the shooting unfolded.

What’s the reaction been?

YouTube spokesman Chris Dale praised the police response to the incident.

“Today it feels like the entire community of YouTube and all of the employees were victims of this crime. Our hearts go out to those who suffered in this particular attack,” he said.

Another online giant, Twitter, said it was horrified by the shooting and said it was monitoring instances of misinformation.

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