Three people have been shot and wounded by a woman attacker at YouTube’s headquarters in Northern California before killing herself, police say.
The suspect has been identified as Nasim Aghdam, 39, a Californian resident of Iranian descent, and police say they are still investigating a motive.
According to police, there is no evidence yet that Nasim Aghdam knew the victims, a 36-year-old man said to be in a critical condition, and two women aged 32 and 27.
Nasim Aghdam had in the past posted material venting anger at YouTube.
She 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.
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, Ed 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.
The man 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.
The three victims were taken to Zuckerberg San Francisco General Hospital. Officials said the 32-year-old woman’s condition was serious and the 27-year-old’s condition was fair.
A fourth person was also taken to hospital with an ankle injury sustained while trying to escape, Ed Barberini said.
Some 1,700 people work at the YouTube HQ. The company is owned by Google and is the area’s biggest employer.
Nasim Aghdam appeared often on YouTube and in one of her videos criticized the platform for discriminating against and filtering her posts.
YouTube terminated Nasim Aghdam’s account following the shooting. Her Instagram and Facebook accounts have also been removed.
On her personal website she accused YouTube of taking steps to prevent her videos from getting views.
“There is no equal growth opportunity on YouTube or any other video sharing site. Your channel will grow if they want to!” she wrote.
There had been earlier media reports that the man shot was her boyfriend, but police later said: “At this time there is no evidence that the shooter knew the victims of this shooting or that individuals were specifically targeted.”
President Donald Trump said he had been briefed about the incident. He wrote on Twitter: “Was just briefed on the shooting at YouTube’s HQ in San Bruno, California. Our thoughts and prayers are with everybody involved. Thank you to our phenomenal Law Enforcement Officers and First Responders that are currently on the scene.”