Leftist military officers overthrew the Caetano government in Portugal in the Carnation Revolution on 25 April 1974. The MPLA, FNLA and UNITA all negotiated peace agreements with the transitional Portuguese government and began to fight one another for control of the Angolan capital, Luanda, and for the rest the country. Holden Roberto, Agostinho Neto, and Jonas Savimbi met in Bukavu, Zaire, in July and agreed to negotiate with the Portuguese as one political entity.