U. S. Army soldiers from the 27th Infantry Regiment pull a bobcat tractor out of the mud at their mountaintop position at Observation Post Mustang in Kunar Province, Afghanistan.

在阿富汗库纳尔省的野马观测站，美国陆军第27步兵团的士兵正在山顶将轻型拖拉机从淤泥中拖出来。

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As U.S. military, Pakistani forces and Afghan officials sought to piece together the incident, Afghan, U.S. and Western officials said the attack took place in response to fire from the remote Pakistani posts in the Mohmand tribal region, a lawless border area that abuts Afghanistan's eastern Kunar province.

WSJ: Airstrike Ravages U.S.-Pakistan Ties

Hekmatyar's stomping grounds include Kunar province, a sweep of heavily forested mountains in eastern Afghanistan.

NPR: For Afghan Fighter the War Continues as Loyalties Shift