WASHINGTON, June 18 (Reuters) - Four U.S. forces were killed in an attack on Bagram Air Base in Afghanistan, a U.S. official said on Tuesday, speaking on condition of anonymity, just as the United States prepares for talks this week with the Taliban.
The official said insurgents attacked the base with some kind of indirect fire, leaving open the possibility it was hit by rockets or mortar rounds. No further details were immediately available.
(Reporting by David Alexander, writing by Phil Stewart)
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