SAN JOSE, Calif.—A California sheriff says a gunman who killed nine people in a rail yard massacre had fired 39 shots and appeared to target some of the victims. Santa Clara County Sheriff Laurie Smith told The Associated Press on Thursday that the shooter told at least one person: “I’m not going to shoot you” at a light rail facility for the Valley Transportation Authority in San Jose. The gunman then shot other people with two semi-automatic handguns. He later shot himself as deputies closed in. Smith said in an interview that the shooter also appeared to have set a timer or slow-burn device to set his home on fire. The fire was reported minutes after the first 911 calls came in from the rail facility. The shooter had talked about killing people at work more than a decade ago, his ex-wife said. “I never believed him, and it never …