The Presidents of Cuba, Venezuela and Guyana have commemorated the 1976 bombing of a Cuban airliner by CIA operatives.
Wreaths were laid on behalf of Cuban President Miguel Diaz-Canel, Army General Raul Castro and other officials during a ceremony at Havana's Christopher Columbus Cemetery on Tuesday.
"The crime of Barbados was a cowardly, murderous and cruel act of terrorism aided by the empire," Diaz-Canel tweeted. "The indignant Cuban people wept, but also reiterated their conviction for sovereignty, they did not surrender.
"The Revolution, still standing, is the worst punishment for the terrorists," he added.
Declassified documents showed the CIA had prior warning of the attack from conversations its operative and bombing plot ringleader Luis Posada Carriles, but failed to warn Cuba.
Guyana's new President Dr Irfaan Ali attended a wreath-laying at the Cubana Air Disaster Monument on the University of Guyana’s Turkeyen Campus.
Most of the Guyanese victims of the attack were young students on their way to take up scholarships in Cuban universities.
Ali was accompanied by Foreign Affairs Minister Hugh Todd, Culture, Youth and Sport Minister Charles Ramson, Honourary Consul to Barbados Captain Gerry Gouveia and the Cuban Ambassador to Guyana Narciso Reinaldo Amador Socorro.
Lugo and Lozano were arrested in Venezuela along with Posada Carriles and Orlando Bosch, both Cuban former CIA operatives and opponents of Fidel Castro's communist government in Cuba.
Posada Carriles escaped prison in 1985 and continued his terrorist activities. In 2005 he sought political asylum in the US after his arrest for entering the country illegally, and avoided extradition to Venezuela when a judge ruled that he faced torture there. The terrorist leader settled in Miami, Florida, where he lived until his death in 2018, joining Bosch who had moved there on his release from prison in 1988.