Iraqi security forces inspect a crater caused by a car bomb attack in the neighborhood of Karrada in Baghdad earlier today (Dec. 22, 2011). It was one in a wave of such bombings in the Iraqi capital today. Hadi Mizban/AP hide caption

itoggle caption Hadi Mizban/AP

Baghdad's traffic, choked by hundreds of checkpoints, slows to a crawl while security forces inspect vehicles for weapons and explosives. Lynsey Addario/National Geographic hide caption

itoggle caption Lynsey Addario/National Geographic