U.S. military officials say three U.S. service members have been killed by a roadside bomb in southern Afghanistan.
Officials made the announcement Wednesday but have not provided any more information.
The bombing comes amid a wave of attacks by Afghan insurgents against U.S. and NATO forces.
Last month was the deadliest for U.S. forces in Afghanistan since the Taliban-led government was ousted in 2001.
Violence has risen steadily in Afghanistan in recent years as the Taliban has fought to extend control across wide swaths of the countryside. The U.S. military and NATO have deployed a record number of troops to try to help Afghan forces crush the insurgency.
Some information for this report was provided by AP and Reuters.