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Police are responding to reports of active shooting at YouTube headquarters in San Bruno California on Tuesday afternoon.

In a tweet, the San Bruno Police and the ATF San Francisco Field Division stated that they are responding to the situation. The police asked people to stay away from Cherry Avenue and Bay Hill Drive.

We are responding to an active shooter. Please stay away from Cherry Ave & Bay Hill Drive.

— San Bruno Police (@SanBrunoPolice) April 3, 2018

The ATF San Francisco Field Division is responding to a reported shooting at YouTube headquarters in San Bruno, Calif. pic.twitter.com/l7XabZ5FpI

— ATF HQ (@ATFHQ) April 3, 2018

In a statement, Google said, "We are coordinating with authorities and will provide official information here from Google and YouTube as it becomes available."

During a news conference, San Bruno Police Chief Ed Barberini said at least four people suffered injuries and were brought to the hospital for medical treatment. Chief Barbeini also stated that they found a dead woman with "self-inflicted injury." He believes that the woman was the shooter.

"This is an active event, an active investigation," said Chief Barbeini adding that numerous law enforcement personnel and different local enforcement agencies are searching the premises to make sure that everything is clear and everyone is out of danger.

Photos and videos on social media showed that SWAT teams surrounding the YouTube campus. YouTube employees are walking out of the building with their hands raised.

Some YouTube employees tweeted that they heard multiple gun shots and hid in their offices.

Active shooter at YouTube HQ. Heard shots and saw people running while at my desk. Now barricaded inside a room with coworkers.

— Vadim Lavrusik (@Lavrusik) April 3, 2018

We headed towards the exit and then saw more people and someone said that there was a person with a gun. Shit.

— Todd Sherman (@tdd) April 3, 2018

I looked down and saw blood drips on the floor and stairs. Peaked around for threats and then we headed downstairs and out the front.

— Todd Sherman (@tdd) April 3, 2018

Police cruisers pull up, hopped out with rifles ready and I told them where the situation was as I headed down the street to meet up with a couple team members.

— Todd Sherman (@tdd) April 3, 2018