“Once again we are confronted with the spectre of a mass casualty situation,” said Andre Campbell, a trauma surgeon at Zuckerberg San Francisco General Hospital and Trauma Center

Police do not know the motive of the YouTube shooting but are investigating a website that shows the suspect accusing the company of restricting her videos.

A woman who believed she was being suppressed by YouTube and told her family members she “hated” the company opened fire at YouTube’s headquarters in California, wounding three people before taking her own life, police said.