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Details of the attack, which reports said occurred in Mohmand region in the Pakistani tribal areas across from Afghanistan, are unclear as there has been no U.S. confirmation of it.

However, the BBC quoted a Pakistani military spokesman that it was a "completely unprovoked and cowardly act" which he blamed on "coalition forces."

The spokesman said the incident "hit at the very basis of cooperation and sacrifice with which Pakistani soldiers are supporting the coalition in war against terror."

The BBC said reports suggested the incident occurred as U.S.-led forces operating in Afghanistan were engaged in anti-Taliban operations.

A Taliban spokesman said eight militants died in the fighting but the BBC said it wasn't clear how and where they died.

Unnamed Pakistani security officials were quoted as saying pro-Taliban militants had attacked inside Afghanistan and that the Pakistani soldiers in at a border post died in the counter offensive.

Earlier this week, Rand Corp., a U.S. think tank, said some in Pakistan's intelligence service and the Frontier Corps were allegedly tipping insurgents in Afghanistan about the location and movements of the coalition forces, the CNN report said. The Pakistan military has called the report a "smear campaign."

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