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Two bombs placed by the CIA-linked Cuban dissident group Coordination of United Revolutionary Organizations exploded on Cubana Flight 455, killing all 73 people aboard.

Coordination of United Revolutionary Organizations

Defunct anti-Castro militant group backed by the US (1976-90s)

The Coordination of United Revolutionary Organizations was a militant group responsible for a number of terrorist activities directed at the Cuban government following the Cuban Revolution. It was founded by a group that included Orlando Bosch and Luis Posada Carriles, both of…
Source: Wikipedia (CC BY-SA)

Cubana de Aviación Flight 455

1976 airliner bombing of a Cubana passenger flight

Cubana de Aviación Flight 455 was a Cuban flight from Barbados to Jamaica that was brought down on 6 October 1976 by a terrorist bomb attack. All 73 people on board the Douglas DC-8 aircraft were killed after two time bombs went off and the plane crashed into the sea. The crash…
Source: Wikipedia (CC BY-SA)