Seven US soldiers have been killed in two separate attacks in Afghanistan on the same day.
Five soldiers were killed in the southern province of Kandahar when they were struck by an improvised bomb on Saturday.
Two others were killed when an Afghan soldier turned his gun on them in the western province of Farah. The Taliban claimed responsibility for the shooting attack in an email from a spokesman.
The deaths cap off one of the bloodiest weeks for international forces this year, Reuters reports.
Including Saturday's attacks and three air crashes, 21 US military personnel have been killed in the last week.
Three British soldiers were also killed on Tuesday by a roadside bomb in the southern province of Helmand.
The attacks underscored the dangers faced by the NATO-led International Security Assistance Force (ISAF), even as they hand over much of the fighting to Afghans ahead of a planned withdrawal next year.