Meanwhile, the political administration in Kurram Agency has said that the tribesmen from Bangash and other tribes have also started to assemble to aid security forces. Clashes are frequent in the area as Afghanistan doesn't recognize the 2,400-kilometer Durand Line (drawn by Britain in 1896) as its worldwide border with Pakistan.
The ISPR claimed that Pakistan expressed restraint following the attack on its troops. Afghan police said that force was used after the Pakistani troops illegally crossed the border. "Mil [military] engagement is underway to defuse situation", the ISPR said in a statement.
According to the ISPR, Afghan Border Police opened fire on FC Balochistan personnel who were deployed in the area to provide security to the Population Census team. He added that local villagers and the Afghan Border Police retaliated with gunfire.
According to Azadi Radio, Pakistani forces are shelling Afghan border posts in Zazi Maiden.
Khost province lies next to the restive tribal belt in Pakistan.
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He confirmed that a civilian was killed and two Pakistani guards were arrested.
Afghan officials often give conflicting casualty figures.
The statement said two paramilitary troops were injured.
Earlier this month, Afghanistan accused Pakistan of carrying out air strikes in its Kunar province, causing "massive property damage" - charges Islamabad vehemently denied. It was further emphasised that cooperation from Afghan side for effective border management was important for preventing cross-border movement of terrorists and militants.