An American soldier has been killed and another wounded in the latest attack on US forces in central Iraq.
Troops have been carrying out raids on Saddam strongholds
Guerrillas used a bomb and gunfire to ambush a military convoy in the town of Habbaniya west of Baghdad near a large military base, US military spokespeople said.
The attack follows news of a fresh attempt to assassinate an Iraqi official belonging to the US-appointed authorities in Baghdad.
Jalal Uldin al-Saghir - a prominent Shia Muslim who is working on Iraq's new constitution - escaped unhurt after his car was fired on as he drove home on Sunday.
It is the second such attack on a member of the US-installed administration in 10 days, the first claiming the life of Governing Council member Akila al-Hashimi who died of her injuries last week.
An official in the Governing Council's press office said Mr Saghir would attend a meeting on the constitution as scheduled on Monday.
Raids on strongholds
In a separate incident, a child was reportedly shot dead by US soldiers in Hawija, west of Kirkuk.
A 10-year-old boy was killed and a 25-year-old man injured when troops opened fire on a demonstration by Saddam sympathisers, the AFP news agency quoted a local doctor as saying.
The report has not yet been confirmed by the US military.
The reports of unrest come after troops reportedly carried out a series of raids on strongholds of the ousted Iraqi regime.
The US 4th Infantry arrested 92 people and seized weapons and ammunition during an operation in Saddam Hussein's hometown of Tikrit, AP news agency reported.
"The people we went after are the trigger-pullers attacking the coalition," said battalion commander Lieutenant Colonel David Poirier.
"We want to send the message that if you pull the trigger on the coalition we will get you," he said.