Throughout the 1990s, Cabindan rebels kidnapped and ransomed off foreign oil workers to in turn finance further attacks against the national government. FLEC militants stopped buses, forcing Chevron Oil workers out, and set fire to the buses on 27 March and 23 April 1992. A large-scale battle took place between FLEC and police in Malongo on 14 May in which 25 mortar rounds accidentally hit a nearby Chevron compound. The government, fearing the loss of their prime source of revenue, began to negotiate with representatives from Front for the Liberation of the Enclave of Cabinda-Renewal (FLEC-R), Armed Forces of Cabinda (FLEC-FAC), and the Democratic Front of Cabinda (FDC) in 1995. Patronage and bribery failed to assuage the anger of FLEC-R and FLEC-FAC and negotiations ended. In February 1997, FLEC-FAC kidnapped two Inwangsa SDN-timber company employees, killing one and releasing the other after receiving a $400,000 ransom. FLEC-FAC kidnapped eleven people in April 1998, nine Angolans and two Portuguese, released for a $500,000 ransom. FLEC-R kidnapped five Byansol-oil engineering employees, two Frenchman, two Portuguese, and an Angolan, in March 1999. While militants released the Angolan, the government complicated the situation by promising the rebel leadership $12.5 million for the hostages. When António Bento Bembe, the President of FLEC-R, showed up, the Angolan army arrested him and his bodyguards. The Angolan army later forcibly freed the other hostages on 7 July. By the end of the year the government had arrested the leadership of all three rebel organizations.