Police on Tuesday said they responded to an active shooter at YouTube's headquarters in San Bruno, Calif.

San Bruno Police Chief Ed Barberini said they were still investigating the incident, but they found a woman dead with a "self-inflicted" wound that they "believe is the shooter." He added that four others had been wounded and had been sent to the hospital.

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"We have four victims who have all been transported for gunshot-related injuries," Barberini said. "We have one suspect who is deceased inside the building with a self-inflicted wound that at this time we believe to be the shooter."

President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE tweeted about the shooting after being briefed, saying that "thoughts and prayers are with everybody involved."

"Was just briefed on the shooting at YouTube’s HQ in San Bruno, California. Our thoughts and prayers are with everybody involved," Trump tweeted. "Thank you to our phenomenal Law Enforcement Officers and First Responders that are currently on the scene."

Was just briefed on the shooting at YouTube’s HQ in San Bruno, California. 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. — Donald J. Trump (@realDonaldTrump) April 3, 2018

The San Bruno Police Department advised people to stay away from the area in multiple posts on Twitter.