San Bruno Police tweeted that the suspect has been identified as 39-year-old Nasim Najafi Aghdam of San Diego. 

The departent has also identified the other victims as a 36-yar-old male, who is said to be in critical condition. Two other females, a 32-year-old and a 27-year-old are in a serious and fair conditions respectively, ABC News reported. 

A fourth person sustained an ankle injury while trying to evade the scene.

"San Bruno Police arrived on scene at 12:48pm, two minutes after the first call, and immediately began searching for a possible suspect. Arriving officers encountered numerous employees fleeing the building. Officers encountered one victim with an apparent gunshot wound to a lower extremity at the front of the building," the police had said in a statement earlier.

"At 12:53 p.m., officers conducting a search located a deceased female inside with a possible self-inflicted gunshot wound. Two additional victims were located after fleeing to a next door business. A total of four people were transported to local hospitals, three of which had gunshot wounds. 

"A perimeter has been set up and SWAT Teams from San Mateo County are conducting an extensive search of the building," read the statement.

After Vadim Lavrusik, a YouTube product employee, got evacuated from the building, he tweeted: "Safe. Got evacuated it. Outside now."

Google chief Sundar Pichai said he does not have words to describe the tragedy.

"There are no words to describe the tragedy that occurred today. @SusanWojcicki & I are focused on supporting our employees & the @YouTube community through this difficult time together. Thank you to the police & first responders for their efforts, and to all for msgs of support," Pichai tweeted.

Meanwhile, US President Donald Trump appreciated the security force for their swift actions.

"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," Trump tweeted.

Meanwhile, reports have suggested that the woman, who was regular YouTuber, had criticised the website in the past in one of her videos.

She questioned YouTube's policy regarding filtering and also alleged that the company discriminated against her posts.

"There is no equal growth opportunity on YouTube or any other video sharing site. Your channel will grow if they want to," she had shared on her personal website.

Following her death, YouTube has terminated her account, while Instagram and Facebook too have removed her account from its respective sites.

 
Image: nasimesabz.com