Disgruntled worker who killed nine appeared to target victims

It took deputies six minutes from the first 911 calls to find Cassidy on the third floor of one of the buildings

Law enforcement officers respond to the scene of a shooting at a Santa Clara Valley Transportation Authority (VTA) facility (Noah Berger/AP)

A gunman who killed nine people at a California railyard where he worked appeared to target some of the victims, a sheriff said.

Samuel Cassidy, 57, arrived at the light rail facility for the Valley Transportation Authority (VTA) in San Jose around 6am on Wednesday with a duffel bag filled with semi-automatic handguns and high-capacity magazines, Santa Clara County sheriff Laurie Smith told The Associated Press (AP).