Relatives of victims and members of Cuba's Civil Aeronautics hold a sign that reads in Spanish 'We Demand Justice!" and pictures of people who died on Oct. 6, 1976, when a Cubana Airlines plane flying from Barbados to Havana exploded in the air, at Colon cemetery in Havana, Cuba, Thursday Oct. 6, 2011. The event also honored other people who the Cuban government says were killed in attacks against the nation. (AP Photo/Javier Galeano)