Nato has raised the number of service members killed in Afghanistan to six, including three Americans.
That makes yesterday the deadliest day for the international force in more than two months, underscoring warnings that casualties will increase as foreign forces step up efforts against the Taliban.
US military spokesman Colonel Wayne Shanks says the Americans died when they were caught up in a firefight with militants during an "operational patrol" in southern Afghanistan.
France says a French sergeant was killed during a clash, while patrolling with Afghans in Alasay, a valley largely under insurgent control. Two more service members were killed later.
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