Roadside bombs killed five U.S. soldiers in Iraq in separate attacks on Sunday. In one attack, four soldiers were killed when a blast hit their vehicle north of Baghdad, the U.S. military said on Monday.
A roadside bomb, one of the most lethal weapons used by Sunni Arab insurgents seeking to topple the Shi'ite-led government backed by Washington, also killed a U.S. soldier in western Baghdad, said the military.
The American casualties came on a day when a spate of car bombings and shootings across Iraq killed about 60 people.
But Prime Minister Nuri al-Maliki said violence was on the decrease and that the country would never slide into a civil war.
"Violence has decreased and our security ability is increasing. We are not in civil war and will never be in civil war," Maliki told CNN in a recorded interview on Sunday.
"What you see is an atmosphere of reconciliation."