Violence also flared up again in Hilla, south of Baghdad, and in the volatile "Sunni triangle" north-west of Baghdad on Saturday.
In Hilla there were fierce clashes involving Sadr supporters and local police - Iraqi officials said that three police and at least 40 militiamen were killed.
In the Sunni stronghold of Samarra, US planes carried out air strikes, killing about 50 insurgents, according to the US military. Local accounts put the number of dead at between five and 12.
In Falluja, US planes bombed several houses on Saturday, killing five civilians and wounding eight others, doctors at the Sunni city's hospital said. The US military has not commented.
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