• LA authorities boost security after threatened rail attack

    A commuter has his bag checked by a Los Angeles County Sheriff's deputy at the Universal City Red Line station in Los Angeles on Tuesday, Dec. 6, 2016. Heavily armed sheriff's deputies are guarding the station and other parts of Los Angeles County's transit system following a threat, which the FBI says specified the attack would occur Tuesday. (AP Photo/Richard Vogel)

    LOS ANGELES (AP) — The FBI said Tuesday it found no evidence that a bomb threat which prompted heightened security at a Los Angeles subway station was real and the anonymous caller who made it may have reported similar phony threats in the past.