In other developments on Saturday, security officials said that the police chief of a town northeast of Baghdad had been abducted on Friday by armed men wearing Iraqi military uniforms.
A convoy carrying Colonel Amer Insaief, police chief of Muqdadiya in Diyala province, was ambushed near the village of Abu Saidr, security officials told AFP news agency.
"He was returning to Muqdadiya from Baghdad yesterday when he was kidnapped near Abu Saidr close to Baquba," a security official in Baquba, capital of Diyala, said.
"Iraq is still under foreign occupation and Iraqis continue to die in great numbers"
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The previous day, an aide for Muqtada al-Sadr, a Shia leader, said al-Sadr could end a ban on activities by his Mahdi Army force due to US and Iraqi raids against his followers.
During Friday's sermon in Kufa, 160 km south of Baghdad, Sheikh Assad al-Nasseri said that patience with US operations was running out.
"It was one decision which could end in one minute and then they will be sorry," he said.
Al-Sadr's imposition in August of a six-month ceasefire has seen as incidental to a drop in the number of people believed to have been victims of Shia "death squads".
The US welcomed al-Sadr's ceasefire declaration but has continued operations against splinter groups of the Mahdi Army.