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From July to September 1987 forces loyal to Denis Sassou Nguesso defeated Kouyous [fr] forces which attempted to overthrow his regime. Pierre Anga, one of the coup leaders, fled to Owando where he was killed on September 6, 1987 ending the coup.
References
Clark, John Frank; Samuel Decalo (2012). Historical Dictionary of Republic of the Congo (Fourth Edition). Scarecrow Press. p. 122. ISBN978-0-8108-4919-8.