Several CIA-linked anti-Castro Cuban exiles among them Rafael De Jesus Gutierrez, a former Cuban intelligence officer turned CIA spy, were implicated by the evidence. Political complications quickly arose when Cuba accused the US government of being an accomplice to the attack. CIA documents released in 2005 indicate that the agency "had concrete advance intelligence, as early as June 1976, on plans by Cuban exile terrorist groups to bomb a Cubana airliner." Former CIA operative and anti-Castro militant and terrorist Luis Posada Carriles denies involvement but provides many details of the incident in his book "Caminos del Guerrero" (Ways of the Warrior). The Coordination of United Revolutionary Organizations, of which Carriles was a member, is widely seen as responsible for the bombing.