Four people are being treated after a shooting at the YouTube headquarters in Northern California, police have confirmed.
A female suspect is dead from a 'self-inflicted wound' added San Bruno Police Chief, Ed Barberini.
Todd Sherman, a product manager in the San Bruno base, wrote on Twitter: "We were sitting in a meeting and then we heard people running because it was rumbling the floor. First thought was earthquake."
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He said he 'looked down and saw blood drips on the floor and stairs', on his way out of the building.
He added: "Police cruisers pulled up, hopped out with rifles ready and I told them where the situation was."
The streaming giant is owned by Google, whose main headquarters are also located south of San Francisco.
The firm tweeted that it is 'coordinating with authorities and will provide official information here from Google and YouTube as it becomes available'.
Featured Image Credit: PA