Two suicide bombers targeted Iraqi police checkpoints in commercial areas in central Baghdad during rush hour Thursday, killing at least 21 people, officials said. The Islamic State group swiftly claimed responsibility for the blasts. Both attacks were carried out by bombers on foot, wearing explosives-laden vests, two police officers said. One bomber struck in Baghdad’s Bab al-Sharji area, killing nine civilians and three police officers there. Forty-five people were wounded in that explosion. The second bomber hit in al-Wathba Square, killing nine people, including four policemen, and wounding 31.