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Four people have suffered gunshot wounds following a shooting at YouTube headquarters in San Bruno, Calif., according to authorities. One of those people is believed by police to be the suspect, who has been killed.

San Bruno police chief Ed Barberini said at a news conference that officers encountered three victims who are “being treated for injuries that are treatable.” Two of the victims had fled into a nearby business, the police later said.

The suspected shooter, a female, suffered a fatal wound that Barberini said “may have been self-inflicted.”

Barberini said police arrived to the scene after 911 calls shortly after 12:45 pm PT and then “immediately began a search for a possible shooter or suspect.” He described the scene on arrival as “chaotic” and said that the building was eventually evacuated.

Stanford University Medical Center spokesperson Lisa Kim told Recode that they are expecting four to five patients to arrive shortly but that she did not have any news on their conditions. Update: Kim now says her information was incorrect and that no patients were treated at her hospital.

President Donald Trump tweeted that he was briefed on the shooting.

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

In a note to staff obtained by Recode, YouTube CEO Susan Wojcicki wrote: “Pls stay secure as police clear building and pls follow police instructions to safety. We have full team here to get you to safety.”

Google CEO Sundar Pichai told his employees: “I know you are in shock right now” and called the incident an “unimaginable tragedy.”

Here is the note that @sundarpichai just sent to Googlers worldwide. pic.twitter.com/bdC6KeTl9c — Google Communications (@Google_Comms) April 3, 2018

Previously: “We are responding to an active shooter. Please stay away from Cherry Ave & Bay Hill Drive,” San Bruno police tweeted.

We are responding to an active shooter. Please stay away from Cherry Ave & Bay Hill Drive. — San Bruno Police (@SanBrunoPolice) April 3, 2018

Google, which owns YouTube, tweeted that it is “coordinating with authorities and will provide official information here from Google and YouTube as it becomes available.”

Re: YouTube situation, we are coordinating with authorities and will provide official information here from Google and YouTube as it becomes available. — Google Communications (@Google_Comms) April 3, 2018

But sources close to the situation said that several people had been shot and that the shooter has been shot, too. It is unclear how seriously anyone has been injured.

Employees at the scene are also reporting the shooting and are trying to protect themselves there. Photos posted to Twitter show YouTube employees being led out of the building with their hands up. There are helicopters on the scene, as well as police SWAT teams.

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

After existing the room we still didn’t know what was going on but more people were running. Seemed serious and not like a drill. — Todd Sherman (@tdd) April 3, 2018

At that point every new person I saw was a potential shooter. Someone else said that the person shot out the back doors and then shot themselves. — Todd Sherman (@tdd) April 3, 2018

The YouTube building is in a busy area of San Bruno, which is near the San Francisco airport. It is run in a separate location from the campus of Google in Mountain View, which is further south. The huge video platform is a unit of the search giant, which, in turn, is part of Alphabet.

Unlike the more college campus-like setting of Google, YouTube is a building right on the street, and its main lobby is relatively accessible — there is security, of course, but it is not noticeably present — in comparison to other tech firms. The site often gets many fans, who want to visit the popular YouTube.

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