sentences:  Though the technician later claimed he had just pocketed the money, many Cubans and some US citizens believed a clandestinely administered biological weapons agent was responsible for a subsequent outbreak of the disease in Cuban turkeys.In 1971 the first serious outbreak of African Swine Fever in the Western Hemisphere occurred in Cuba.The Cuban government alleged that U.S. covert biological warfare was responsible for this outbreak, which led to the preemptive slaughter of 500,000 pigs.