Two US soldiers have been killed and one injured in an ambush in northern Iraq, the US military has said.
Iraqis celebrate the destruction of a US vehicle
A spokesman for US-led forces said they came under fire from rocket-propelled grenades near the city of Kirkuk on Saturday evening.
In a separate incident, attackers targeted a US military convoy in Falluja, central Iraq, causing a US vehicle to explode, but no casualties.
Reports say an Iraqi was killed and at least one other injured when US troops opened fire after the attack which came after the lorry had broken down.
Television pictures showed a US military vehicle, believed to be an ammunition lorry, in flames - while a crowd of jubilant Iraqis gathered at the scene.
"Falluja has destroyed the Americans," some men shouted.
The Kirkuk attack takes to 103 the number of American troops confirmed killed in combat in Iraq since President George W Bush declared major hostilities over on 1 May.
After the attack in Falluja, Iraqi police said to be acting on orders from the US military detained a photographer for the French news agency AFP along with a Reuters cameraman, AFP said.
The reason for their detention was not clear.
The latest violence comes days after the US won support at the United Nations Security Council for a new resolution on Iraq.
The resolution calls for Iraq's interim leaders to submit by mid-December a timetable for new constitution and subsequent elections.
The US hopes the UN backing will persuade more nations to contribute troops and money to help stabilise and rebuild Iraq.