Twin car bombings in the Iraqi capital killed at least 13 people Saturday at a market in a primarily Shi'ite area of eastern Baghdad.
After a suicide car bomber struck, a parked car exploded, hitting people who had rushed to help victims of the first blast.
In another Shi'ite neighborhood, gunmen dressed in Iraqi military uniforms kidnapped eight people from an electronics store.
Iraqi officials say attacks on Shi'ite areas have increased since Prime Minister Nouri al-Maliki announced a plan to crack down on militants. He discussed the plan with President Bush by telephone Saturday, although details of what Mr. Maliki intends to do are still not known.
Meanwhile, the U.S. military says airstrikes killed 14 militants outside Baquba, north of Baghdad, Saturday morning. The military says roadside bombs have killed six U.S. soldiers since Thursday.
The U.S. military has also released more details about an attack on a post in Karbala last week in which four U.S. soldiers were captured, then killed. Officials say the attackers wore American-style combat uniforms, carried American-style weapons and spoke English to pass Iraqi-guarded checkpoints.