A woman opened fire at the company's San Bruno campus on Tuesday, wounding at least three people before she shot and killed herself, police say.
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"This is a terrible day in the United States. Once again, we have a mass casualty situation that is confronted here at Zuckerberg SF General Hospital," said Dr. Andre Campbell, a trauma surgeon at Zuckerberg SF General Hospital.
VIDEO: Aerial footage shows active shooting situation at YouTube HQ
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Watch the video above to hear what he had to say.
Click here for full coverage on the shooting at YouTube's headquarters.
PHOTOS: Powerful images from shooting at YouTube HQ in San Bruno
Police and witnesses say a woman opened fire Tuesday at YouTube headquarters in San Bruno, wounding three people before fatally shooting herself as terrified employees huddled inside.