Two car bombs are reported to have killed at least 16 people and wounded 65 others in the Iraqi capital, Baghdad.
Sources said one car bomb exploded in a market and the other in a petrol station.
Earlier, a woman died when a US helicopter fired rockets at a house in the, mainly Shia, Sadr City area.
Separately, the US military in Iraq said that four US soldiers had been killed in rebel attacks.
Three soldiers were killed in a roadside bomb south of Baghdad yesterday, and another died of his wounds in a separate shooting attack.
A marine also died of wounds after being hit by small arms fire near the former insurgent stronghold of Fallujah, west of Baghdad, a statement said.
Arab Sunni rebels are waging a campaign of suicide bombings, roadside bombs and shootings in a bid to drive out US troops and topple the Shi'ite-led government.
