UPDATE (Matt): NBC News is reporting that a female suspect is dead at the scene. No reports on how many have injured or killed yet.
NBC News: Female suspect dead at scene of YouTube shooting— Jesse Rodriguez (@JesseRodriguez) April 3, 2018
NBC is reporting female suspect deceased at the scene with an unknown number of victims— Ben Jacobs (@Bencjacobs) April 3, 2018
UPDATE II (Matt): Fox News is reporting that the female suspect shot her boyfriend and several others before committing suicide.
#BREAKING: Fox News is reporting that the suspected female shooter at YouTube shot her boyfriend and several others before killing herself.— Ryan Saavedra ???? (@RealSaavedra) April 3, 2018
UPDATE III (Micah): Police held a brief presser around 5:30 P.M. Here are the details:
At 12:46 pm 911 calls were received about gunshots on the YouTube campus. Law enforcement arrived on scene at 12:48 pm. There is one female deceased on scene from what appears to be a self-inflicted gunshot world. It has yet to be confirmed if the deceased individual is the shooter. Four other victims were transported to nearby hospitals and one is said to be in critical condition.
An active shooter has been reported at the YouTube headquarters in San Bruno, California. The office is currently on lockdown and there is a heavy police presence near the building.
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
Lavrusik later tweeted that he was "safe" and had been evacuated from the building.
The San Bruno Police are sending out warnings to the community.
Police activity at 901 Cherry Ave, please stay out of the area. pic.twitter.com/H6iAj0g7ra— San Bruno Police (@SanBrunoPolice) April 3, 2018
Multiple people have been hospitalized, according to officials.
This is a breaking news story and will be updated.