five officials of the Frontier Corps (FC) were martyred and five injured in a cross-border attack in Kurram Agency, the Inter Services Public Relations (ISPR) said on Sunday.
According to the ISPR, the military's media wing, the officials reviewing arrangements to erect fences on the Pak-Afghan border when the incident occurred.
The ISPR claimed that Pakistan expressed restraint following the attack on its troops.
At least two security personnel deployed on the Pak-Afghan border were martyred and another five injured in an attack from across the border, officials of the political administration in Kurram Agency said on Sunday.
The attack was carried out from the Khost province of Afghanistan on a border post in Laka Tika area of Lower Kurram Agency, said the officials.
The security forces have launched a counter attack while, according to government officials, scores of armed tribesmen from Bangash and other tribes have started assembling to support the security personnel.
Tribal elders reportedly made announcements at several mosques in the nearby areas, appealing tribesmen to join the security personnel on the border. Following the announcements, several armed tribesmen, belonging to Toori Bangish and other tribes started approaching the border posts.
An investigation into the firing incident has been initiated.
Kurram is one of the most sensitive tribal areas as it borders three Afghan provinces and at one point was one of the key routes for militant movement across the border.
Pakistan began fencing the Pak-Afghan border last year to prevent terrorists from crossing into the country from Afghanistan.
The two countries accuse the other of harbouring their militant enemies — both deny the other's charges.
