The clash took place on Wednesday in the Angoor Adda village of South
Wazoo, a tribal area in Pakistain's northwest. Some reports say the fighting broke out after Afghan troops crossed over into the Pak side of the border. Others, however, say the clash was triggered by the bombardment of an Afghan army checkpoint.
The district's top administrator Atifur Rehman said that the festivities erupted after dozens of the Afghan National Army attacked a Pak border post in South Waziristan, DPA reported.
He went on to say that the two sides exchanged mortar fire for hours at the post near the village of Angoor Adda, injuring several Pak troops.
Afghan and Pak forces occasionally trade fire but the incidents rarely escalate or result in a diplomatic row.