Female suspect in shooting at YouTube's headquarters died of apparent self-inflicted gunshot wound, police say

San Bruno Police Chief Ed Barberini said the scene was an "active event" and that law enforcement was methodically searching the building to "make sure it is clear." The building has been evacuated, and investigators are expected to be on the scene "through the night," he said.

The shooting appears to be the result of a domestic situation, two law enforcement officials told ABC News. The incident does not appear to be terror-related, the sources said.

A handgun was used in the attack, he said. The identity of the suspected shooter has not been released.

There is no immediate threat to the community, Barberini said.

At least four victims have been transported to area hospitals, Barberini said. Three of those victims sustained gunshot wounds, while the fourth victim suffered a non-life-threatening injury such as a broken or twisted ankle, he said.

Three people have been transported to Zuckerberg San Francisco General Hospital spokesman Brett Andrew told reporters in a press conference.

A 36-year-old male patient is in critical condition, Andrew said. One female victim, 32, is in serious condition, and another female victim, 27, is in fair condition, he said.

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