8:00 PM PT -- The alleged shooter has been identified by NBC as Nasim Aghdam of Southern California.

6:00 PM PT -- One of the victims -- a 36-year-old male in critical condition -- was reportedly the shooter's boyfriend. The 2 other injured victims are women ages 32 and 27. The shooting is being investigated as a domestic dispute, according to the AP.

2:39 PM PT -- San Bruno Police Chief Ed Barberini just held a news conference and said 4 victims suffering from gunshot-related injuries were transported to a hospital. The woman believed to be the suspected shooter died inside the building from a possible self-inflicted gunshot wound. Police did not release the identity of the suspect.

2:17 PM PT -- Several reports say the female suspect is dead at the scene. It's currently unknown if she was killed by police or shot herself.

There's an active shooter at YouTube Headquarters in Northern California and, according to police dispatch audio, the alleged suspect is a female who's been shot in the chest.

In the audio, you hear an officer note there's a woman down with a gunshot wound to her chest. Another voice on the dispatch mentions the woman is the suspect and the first officer gets back on dispatch to confirm there's a handgun near the alleged suspect's body.

Police are still on scene at the San Bruno, CA headquarters. According to emergency dispatch, 37 people were injured on scene, it's not clear what from. Cops have advised people to steer clear.

At least 1 employee tweeted he heard gunshots and saw people running while he was sitting at his desk. He also said he barricaded inside a room with co-workers before tweeting he had been evacuated.

YouTube's headquarters houses nearly 2,000 employees.