A woman shot multiple people Tuesday at YouTube's headquarters in San Bruno, according to San Bruno Police.
Sources tell KRON4 that a woman shot and killed her boyfriend.
Police say the shooter is dead from a self-inflicted gunshot wound.
There are at least four victims being treated at hospitals in the Bay Area.
A witness told KRON4's Gabe Slate that they heard 20 shots fired. He also heard that a woman was shot and crawled into the Carl's Jr. next to YouTube.
Stanford Hospital says it has received four to five patients from the shooting.
San Francisco General hospital say they are treating three gunshot victims, two women and a man.
One of the women is 32 years old and is seriously injured, according to police.
The other woman is 27 years old and is in fair condition.
The man is 36 years old and is in critical condition.
A YouTube employee tells CNN she saw one person shot on the patio where they eat.
2:40 p.m. PT: San Bruno Police Chief Ed Barberini told reporters at a news conference that the suspected shooter, a female, was dead from a self-inflicted gunshot. Barberini said four other people were hospitalized after being shot at the scene.
The building was evacuated and police were clearing it following the shooting. Multiple agencies were on scene, and the investigation was ongoing, Barberini said.