 In retaliation for Pakistan's assistance to the insurgents, the KHAD Afghan security service, under leader Mohammad Najibullah, carried out (according to the Mitrokhin Archives and other sources) a large number of operations against Pakistan.In 1987, 127 incidents resulted in 234 deaths in Pakistan.In April 1988, an ammunition depot outside the Pakistani capital of Islamabad was blown up killing 100 and injuring more than 1000 people.