It bears mentioning that at least two security official were martyred and five others were left injured in an attack from Afghanistan near the border in Lower Kurram, according to Inter-Services Public Relations.
The ISPR claimed that Pakistan expressed restraint following the attack on its troops.
The Pakistani military confirmed the casualties, saying that its border guards were "fired upon from the Afghanistan side" during a routine surveillance mission. The Afghan officials blamed that the Pakistani troops crossed on to their side of the border, prompting a response by border forces and the local tribal force.
Two Pakistani soldiers were killed in cross-border fire from Afghanistan while working on a fence meant to cover almost all of the disputed 2,500km border separating the countries, the Pakistani military said on Sunday.
Tribal elders reportedly made announcements at several mosques in the nearby areas, appealing tribesmen to join the security personnel on the border. "Mil engagement is underway to defuse the situation." the statement added.
Pakistan began fencing the Pak-Afghan border past year to prevent terrorists from crossing into the country from Afghanistan.
Col. Abdul Hanan, interim chief of the Afghan National Police, told Anadolu Agency clashes broke out in the morning when Pakistani border forces allegedly opened fire at villages in Zazi Maiden district along the Durand Line. Three civilians were also wounded, he added.
Clashes are still underway, Col. Hanan said.
Earlier in April, Afghanistan accused Pakistan of conducting the air strikes and firing hundreds of shells in Afghan's eastern border province of Kunar. It was once an ideal point for militants to move across the border in the past.