Members of the Los Angeles County Sheriff's Department SWAT team, right, storm a Southern California Rapid Transit District bus in Beverly Hills, Calif., early Thursday after a woman brandishing a gun killed a passenger. Police killed the unidentified woman in the assault after first using a diversionary grenade. The grenade's smoke is visible at right. The driver and other passengers fled the bus, and the woman barricaded herself in the bus until it was stormed about three hours later.