Two car bombs in quick succession struck a market in a mainly Shiite district in Baghdad on Saturday, killing at least 13 people and wounding more than 40, police said. The attack began about 12:15 p.m. in New Baghdad in the eastern half of the capital when a suicide car bomber plowed into the busy commercial area. A parked car bomb exploded shortly afterward as people converged on the area to help the victims or see what had happened _ a common tactic in the relentless attacks by suspected Sunni insurgents. The 13 killed included two policemen, while four officers were among the 42 wounded, according to police reports. The blast left the burned-out hulks of cars and vans in the area with a bag of fruit sitting among pieces of metal that were scattered on the ground. Men carrying children and women shrouded in black rushed to the hospital.