04 April, 2018
One woman who lives close to the online giant's headquarters told how she heard a series of gunshots.
Lisa Kim, a spokeswoman for Stanford Health Care, said the hospital was receiving between four to five patients from the shooting incident at the YouTube offices.
Brent Andrew, a spokesman for the Zuckerberg San Francisco General Hospital, told The Hollywood Reporter they have received "a number of patients with gunshot wounds" and anticipates more.
YouTube staff said they had been barricaded in a room to keep them safe before being taken outside.
Officers run toward a YouTube office in San Bruno, Calif., Tuesday, April 3, 2018.
An employee of a nearby Walmart store near the complex told NBC Bay Area that he heard about 15 shots "from the direction of the YouTube building, from what sounded like inside".
"We headed towards the exit and then saw more people and someone said that there was a person with a gun".
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Additional details about the situation were not immediately available.
Sherman said he initially thought the sound of people running was an "earthquake" before realising a shooter had stormed the building.
The Bureau of Alcohol, Tobacco, Firearms and Explosives also said it responded to the shooting at YouTube's suburban campus.
Employee Vadim Lavrusik followed up his original tweet, revealing employees were safely evacuated and were outside the building.
Television footage showed police activity surrounding the campus at 901 Cherry Avenue.
Google, which owns the website, posted on Twitter that the company is coordinating with authorities.
The White House says President Donald Trump has been briefed on a shooting at YouTube headquarters in Northern California and that officials are monitoring it.