The American service member died in an insurgent attack Sunday, the U.S. military said without providing details. Estonia's Defense Ministry said two soldiers were killed after their unit stumbled on a roadside bomb in southern Helmand province.

It was the 37th death for the U.S. military in Afghanistan since the beginning of August, a month that has seen a jump in attacks and violence as the country prepared for its second-ever direct presidential election last week.

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