Police release dramatic body-cam video of rail yard shooting in Northern California | WATCH

Police have released body-camera footage of the tense encounter after a gunman who killed nine co-workers at a Northern California rail yard shot himself twice in the head.

A gunman who killed nine co-workers at a Northern California rail yard shot himself twice in the head as sheriff's deputies raced into a building, according to authorities who on Tuesday released body-camera footage of the tense encounter. The nearly 4 1/2 minutes of footage is from one deputy who arrived minutes after the first shooting reports and while shots were still being fired at the Santa Clara Valley Transportation Authority bus and rail yard in San Jose, where 57-year-old Samuel Cassidy opened fire before killing himself.