On 13 September, Taraki invited Amin to the presidential palace for lunch with him and the Gang of Four. Amin turned down the offer, stating he would prefer their resignation rather than lunching with them. Soviet ambassador Puzanov persuaded Amin to make the visit to the Presidential Palace along with Taroon, the Chief of Police, and Nawab Ali, an intelligence officer. Inside the palace on 14 September, bodyguards within the building opened fire on the visitors. Taroon was killed but Amin only sustained an injury and escaped. Amin drove to the Ministry of Defence building, put the Army on high alert and ordered Taraki's arrest. At 6:30 pm tanks from the 4th Armoured Corps entered the city and stood at government buildings. Shortly afterwards, Amin returned to the palace with a contingent of Army officers, and placed Taraki under arrest. The Gang of Four, however, had "disappeared" and sought refuge in the Soviet Embassy.