On 28 April 1955, the Vietnamese National Army launched an attack against Bình Xuyên military force in the city. The battle lasted until May, killing an estimated 500 people and leaving about 20,000 homeless. Ngô Đình Diệm then later turned on other paramilitary groups in Saigon, including the Hoa Hao Buddhist reform movement. On 11 June 1963, Buddhist monk Thích Quảng Đức burned himself in the city, in protest of the Diệm regime. On 1 November of the same year, Diệm was assassinated in Saigon, in a successful coup by Dương Văn Minh.