Article Photos: Iraqi militants accidentally kill 21 of their own 1/6

FILE - In this Wednesday, Feb. 5, 2014 file photo, Smoke rises after a parked car bomb went off at a commercial center in Khilani Square in central Baghdad, Iraq. Car bombs are one of the deadliest weapons used by the al-Qaida breakaway group in Iraq that dominates the Sunni insurgency in Iraq, with coordinated waves of explosions regularly leaving scores dead in Baghdad and elsewhere across the country. (AP Photo/Karim Kadim)