Three people have been admitted to the Zuckerberg San Francisco General Hospital on Tuesday night following a shooting at the YouTube HQ in the western Californian city of San Bruno.

YouTube’s San Bruno HQ remained on lockdown after the attack Tuesday afternoon. A woman, allegedly identified as Nasim Najafi Aghdam, armed with a 9mm handgun, opened fire in the HQ before turning the gun on herself.

According to local media, two of the three victims are in serious condition. Investigation into the incident is underway.

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