The U.S. military says 14 Americans have been killed in a series of helicopter crashes in Afghanistan.
Three agents from the U.S. Drug Enforcement Administration are among the 14 dead.
A U.S. statement says seven U.S. troopers and three U.S. civilians working for the government died when their helicopter went down early Monday in western Afghanistan. Twelve Americans and 14 Afghans were injured.
Also Monday, two U.S. helicopters collided in southern Afghanistan, killing four American troops and wounding two others.
U.S. authorities have ruled out hostile fire in the collision but have not given a cause for the other crash. The Taliban say they shot down a helicopter in Badghis province of northwestern Afghanistan but it was unclear if this is the same incident.