Police in Northern California are responding to reports of a shooting at YouTube headquarters in the city of San Bruno.
City Manager Connie Jackson says there have been multiple 911 calls reporting a shooting and that police and fire officials have responded.
TV helicopter video shows officers patting down people grouped outside a building and police vehicles surrounding the area. San Bruno police said they could not provide more information.
The world's biggest online video website is located on a suburban campus.
Calls and emails to YouTube representatives were not immediately returned.
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