On 1 November 1963, Conein donned his military uniform and stuffed three million Vietnamese piastres into a bag to be given to General Minh. Conein then called the CIA station and gave a signal indicating that the planned coup against President Diem was about to start. Minh and his co-conspirators swiftly overthrew the government. With only the palace guard remaining to defend Diệm and his younger brother Nhu, the generals called the palace offering Diệm exile if he surrendered. That evening, however, Diệm and his entourage escaped via an underground passage to Cha Tam Catholic Church in Cholon, where they were captured the following morning. On 2 November 1963, the brothers were assassinated together in the back of an M113 armored personnel carrier with a bayonet and revolver by Captain Nguyễn Văn Nhung, under orders from Minh given while en route to the Vietnamese Joint General Staff headquarters. Diệm was buried in an unmarked grave in a cemetery next to the house of the US Ambassador.