The US military in Iraq says American and Iraqi forces killed nine suspected al-Qaeda fighters in a raid near Talafar in Ninewa province last Sunday.
Three Iraqi troops were killed in the operation, which the US said targeted a suspected militant training camp.
The Americans said militants based at the camp had carried out assassinations and roadside bomb attacks throughout the Talafar area.
It said troops had found bomb-making equipment and weapons at the scene.
In another operation, US soldiers shot and killed a man who was said to have drawn a pistol and then tried to detonate an explosives vest.
US and Iraqi government forces are pushing to take control of Ninewa province, where correspondents say insurgent fighters are making a stand after their influence diminished in Baghdad and other areas during 2007.