A woman opened fire at YouTube’s global headquarters in Silicon Valley, shooting three people before killing herself, police said.

Chief Ed Barberini of San Bruno police said that the three victims suffered from “treatable injuries”. Two were shot “at an adjacent business”.

A 32-year-old female was described as being in a serious condition; a 27-year-old female was in a fair condition, and a 36-year-old male was described as being in a critical condition by CNN.

The police chief said late Monday that the weapon used in the shooting was a handgun.

He said that the first 911 calls came at 12:46pm, and his officers were on the scene two minutes later. Full report on The Telegraph.