Melia Robinson Business Insider
Police investigate YouTube HQ following the shooting.
On Tuesday, a shooting at YouTube headquarters in San Bruno, California left at least four injured and one person dead.
Business Insider reporters were on the scene in the aftermath of the terrifying incident, as YouTube employees and onlookers waited for police to give the all-clear and certify that they were safe.
Here are the first photos from YouTube HQ in the hours after the shooting: