The US military says it has arrested an American soldier serving in Iraq over the killing this week of two comrades.
Staff Sergeant Darris Dawson, 24, and Sergeant Wesley Durbin, 26, were shot dead on Sunday at their patrol base near Iskandariyah, just south of Baghdad, a military statement said.
"A US soldier is in custody in connection with the shooting deaths," it said.
"He is being held in custody pending review by a military magistrate."
The US military has lost 4,168 soldiers in Iraq since the 2003 invasion, according to an AFP count based on independent website icasualties.org.
Seven were killed when their transport helicopter crashed near the southern city of Basra.