It provided no further details.
Fidel Castro ruled Cuba as a one-party state for almost half a century before handing over the powers to his brother Raul in 2008.
His supporters praised him as a man who had given Cuba back to the people. But his opponents accused him of brutally suppressing opposition.
In April, Fidel Castro gave a rare speech on the final day of the country`s Communist Party congress.
He acknowledged his advanced age but said Cuban communist concepts were still valid and the Cuban people "will be victorious".
"I`ll soon be 90," the former president said, adding that this was "something I`d never imagined".
"Soon I`ll be like all the others, "to all our turn must come," Fidel Castro said.
Cuba`s Fidel Castro dies aged 90
26 November 2016
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Fidel Castro, Cuba`s former president and leader of the Communist revolution, has died aged 90, state TV has announced.
