In the years after the event, some journalists and activists, as well as the Costa Rican judiciary, pointed to the United States government's Central Intelligence Agency (CIA), which was seeking to direct the Contra insurgency against the leftist Sandinista regime in Nicaragua, as responsible for the bombing. However, in 1993 the man who had placed the bomb, and who had attended the press conference under a false identity as a Danish photographer named Per Anker Hansen, was revealed to have been an Argentine leftist whose real name was Vital Roberto Gaguine and who had died in 1989 during a guerrilla attack on a military base in Argentina.