The US Justice Department on Wednesday indicted 94-year-old former Cuban president Raul Castro over the 1996 downing of civilian planes manned by critics of the communist state.
An unsealed indictment accused Castro and others of a conspiracy to kill Americans and other charges.
"For nearly 30 years, 30 years, the families of four murdered Americans have waited for justice," acting US Attorney General Todd Blanche said in Miami.
"My message today is clear: The United States and President (Donald) Trump does not and will not forget its citizens."
Blanche also said he expected Castro to end up in prison, suggesting Washington could seize him if he does not surrender.
