Three people were seriously wounded after a woman opened fire at YouTubes headquarters in San Bruno, California, on Tuesday then fatally shot herself.
The shooting marks the latest episode of gun violence since Februarys massacre at a Florida high school revived the national debate about firearms regulations.
Officers and federal agents arrived on the scene after receiving multiple 911 calls reporting gunfire. Officers discovered a victim with a gunshot wound, then found the shooter with what appeared to be a self-inflicted gunshot wound, Associated Press reported. Two other gunshot victims were located at a nearby business.
The police department posted live updates on its Twitter account, and YouTube employees with verified Twitter accounts tweeted about hearing shots and fleeing the building or barricading themselves in rooms.
San Francisco General Hospital admitted three patients related to the incident: a 36-year-old man in critical condition, a 32-year-old woman in serious condition and a 27-year-old woman in fair condition, according to APs report.
President Donald Trump said on Twitter that he had been briefed about the shooting. He added: “Our thoughts and prayers are with everybody involved. Thank you to our phenomenal Law Enforcement Officers and First Responders that are currently on the scene.”
The shooting is just the latest episode of gun violence to confront Trumps administration.
Since Trump took office, there have been three mass shootings with 10 or more fatalities: Novembers Sutherland Springs church shooting in Texas that left 27, including the shooter, dead; the Las Vegas shooting in October, the deadliest in U.S. history, which left 59, including the perpetrator, dead; and the February attack at Marjory Stoneman Douglas High school in Parkland, Florida, which left 17 dead.
The Florida attack has sparked a surge of activism for stricter gun laws, marked most prominently by mass marches around the country on March 24.
This story has been updated with new information.