ISLAMABAD: Pakistan says it has started building a fence along the Afghan border in areas where it says militants have launched cross-border attacks, a move that could worsen tensions with Afghanistan, which has never accepted the colonial-era frontier.

Gen. Qamar Javed Bajwa, the head of Pakistan’s armed forces, announced the construction of fencing in “high threat zones” Saturday during a visit to tribal regions along the border, saying it was in the interest of both countries.

The two countries share a 2,400-kilometre internationally recognised border known as the Durand Line, which was drawn in the 19th century, when the British dominated South Asia.

The Afghan government has never recognised the border, which runs through the Pashtun heartland, diluting the power of Afghanistan’s largest ethnic group on both sides.

Najib Danish, the deputy spokesman for the Afghan Interior Ministry, said authorities had not yet seen any signs of construction along the frontier but would move to prevent any such project.

“Building fences or any construction is not acceptable for us and we won’t allow anyone to do it,” he said.

Pakistan and Afghanistan have long accused each other of turning a blind eye to Islamic militants operating along the porous frontier, and Pakistan recently closed the border for more than a month

Bajwa said Pakistan is trying to develop a bilateral border security mechanism with Afghanistan.

The COAS interacted with troops at Suran and Kalaya, and hailed their high morale, operational preparedness and effective response to recent cross border terrorist attacks.

He appreciated the killing of five terrorists, including high-value terrorist Duran in a recent IBO (intelligence- based operation) and greatly valued the ‘Shahadat’ (martyrdom) of Major Mudassar and two soldiers during the operation.

General Bajwa said he was proud of the great sacrifices made by the security forces and the people of Pakistan in the effort to clean the country from these fasaadis (rioters).