SAN JOSE — Authorities are trying to determine the motive for a mass shooting that left eight people dead Wednesday morning at a Valley Transportation Authority rail yard in San Jose. The gunman, who worked there and had some kind of workplace dispute, also is dead. Details about the gunman and the attack are beginning to emerge. He was identified by sources as Samuel Cassidy, 57, a maintenance worker at the VTA. Sources said the suspect is believed to have killed himself after the mass shooting. Early indications are that the shooting was related to a workplace issue, according to...