WASHINGTON – While FBI officials were dismissing terrorism in the shooting of a security guard at a chemical plant in Texas just hours after they were summoned to investigate, they weren't nearly so skeptical about the possibility last year. Robbie House, an unarmed security guard at the BASF plant in Freeport says he was shot by a Middle Eastern gunman after confronting him near an ammonia storage facility last week. Now House says the FBI doesn't believe his story and suggests he shot himself. Off the record, some law enforcement officials say they believe House's story and think he may...