Three shot at California female suspect dead . Youtube Today

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

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.

• How YouTube shooting unfolded online

What happened?

The suspect is reported to have approached an outdoor patio and dining area near lunchtime and opened fire with a handgun.

San Bruno Police Chief Ed Barberini said officers arrived at the offices 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 appeared to show 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 a nearby 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.