Press Release regarding YouTube incident - https://t.co/4fZtzVQ3Aq

Additional press conference will take place at 4:30pm. pic.twitter.com/nHwZMuOfl3 — San Bruno Police (@SanBrunoPolice) April 3, 2018

The San Bruno Police Department held a press conference shortly after 5:30 PM ET confirming four victims, one of whom died, a female with an apparently self-inflicted gunshot wound.

"We have four victims who have all been transported [to area hospitals] for gunshot related injuries," said San Bruno police chief Ed Barberini, "and we have one subject who is deceased inside the building with a self-inflicted gunshot wound and at this time we believe to be the shooter, but we're still following up on that."

The police suspected but did not confirm whether she was the shooter. Those wounded have been transported to nearby hospitals with "treatable" wounds according to the police chief. The YouTube HQ building has been evacuated fully as far as they know.

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

Update: Google CEO Sundar Pichai sent the note below to all company employees. At a second press conference, the police did not confirm whether or not the suspect is an employee or their identity. CBS News reported that San Francisco General Hospital is treating three patients, including two women and a man.