IS has taken credit for an attack on 8 April on the largest US military base in Afghanistan - Bagram airfield, near Kabul. The attack came as 100 Taliban prisoners were released, as a prerequisite for peace talks. More prisoners should be released near the Bagram base. The government is required to free 5,000 Taliban prisoners, with the Taliban releasing 1,000 members of the Afghan security forces. There is disagreement over the procedure, as to whether senior Taliban commanders would be covered by the deal.