Seven U.S. service members were killed on Saturday in one of the deadliest days for Americans in Afghanistan in recent months, as the Taliban continued attacks against foreign troops as part of their spring offensive.

The U.S.-led coalition reported that five international troops were killed by a roadside bomb in southern Afghanistan, it was confirmed they were all Americans.

The coalition also reported that a soldier with the Afghan National Army turned his weapon on coalition troops in the west, killing two, both Americans.

Such attacks by members of the Afghan security forces against their fellow colleagues or international troops have eroded confidence in the Afghan forces as they work to take over from foreign forces.

It was the fourth time since last summer that seven Americans have been killed on a single day in the war.