A shootout occurred at YouTube's San Mateo, California headquarters, Vadim Lawrusik, a Twitter employee, said on Twitter. There are emergency services and police on site.
As Vadim Lawrusik wrote, "he heard shots and saw people running towards him". Moments later, in the second entry Lawrusik reported that he had already been evacuated by the police.
According to the Daily Mail, at least two people have been harmed, and the woman is an assailant.
