NEW DELHI: Cooling ties between Afghanistan and Pakistan took a further hit on Thursday evening, with the Afghan government saying the attack on Kabul ’s American University was orchestrated from Pakistan. Afghan President Ashraf Ghani spoke with Pakistan Army chief Raheel Shariff and demanded strong action against the terror networks responsible for the attack.Kabul’s accusation that the attack was orchestrated from across the Durand Line, the AfPak border, comes at a time of spiralling relations between the neighbours. Recent developments have also seen Kabul increasingly playing up the optics of its closeness with New Delhi, and of lethal weaponry transfer from India.Afghanistan’s accusation came in a statement from the country’s National Security Council , which met at the Presidential Palace for an extraordinary session on Thursday, reported Afghan news outlet Pajhwok.The statement said President Ghani had spoken on the phone with Pakistan Army chief Raheel Sharif and demanded “serious and practical measures against the perpetrators of the attack”, Pajhwok reported the statement as reading.Meanwhile, Pakistan’s Inter-Services Public Relations said General Shariff had promised Afghanistan that it would not allow Pakistani soil to be used to stage attacks on Afghanistan. “Afghan authorities have shared 3 mobile telephone numbers allegedly used during the University attack who allegedly were on contact with the attackers… Our evaluation of the evidence provided and outcome of Combing op so far, has shown that all Afghan SIMs used during the attack were from a network owned and operated by Afghan company whose spill over signal affects some areas along Pak-Afghan border,” read a statement from ISPR Relations between Afghanistan and Pakistan have been strained in recent times, with Kabul pressing for stringer action against Taliban terrorists who are waging war against the Afghan government. Wednesday’s attack on Kabul saw a near-10-hour siege of the American University campus. A total of 13 people were killed and 53 injured in the attack.Kabul’s pinning of the attack as emanating from Pakistani soil also comes a day after Islamabad expressed disappointment over a US decision to block $300 million in military aid for not doing enough to fight terror outfits like the Haqqani network.