In April 1992, as the Democratic Republic of Afghanistan began to collapse, government officials joined the mujahideen, choosing different parties according to their ethnic and political affinities. For the most part, the members of the "khalq" faction of the PDPA, who were predominantly Pashtuns, joined with Hekmatyar. With their help, he began on 24 April to infiltrate troops into Kabul, and announced that he had seized the city, and that should any other leaders try to fly into Kabul, he would shoot their plane down. The new leader of the "Islamic Interim Government of Afghanistan", Sibghatullah Mojaddedi, appointed Ahmad Shah Massoud as defense minister, and urged him to take action. This he did, taking the offensive on 25 April, and after two days heavy fighting, the Hezb-i Islami and its allies were expelled from Kabul. A peace agreement was signed with Massoud on 25 May 1992, which made Hekmatyar Prime Minister. However, the agreement fell apart when he was blamed for a rocket attack on President Mojaddedi's plane. The following day, fighting resumed between Burhanuddin Rabbani's and Ahmed Shah Massoud's Jamiat, Abdul Rashid Dostum's Jumbish forces and Hekmatyar's Hezb-i Islami forces.