One person was killed and three others were injured in a fiery two-vehicle collision Saturday in the West Adams area of Los Angeles. Los Angeles Fire Department firefighters were called at 2:55 a.m. to 2601 W. Obama Blvd. and Sixth Avenue where they learned one of the vehicles sheared a fire hydrant during the collision and subsequently slammed into a house, which then caught on fire, LAFD spokesman Brian Humphrey said.