UN Secretary-General Ban Ki-moon meets with Fidel Castro in Havana

U.N. Secretary-General Ban Ki-moon wears a hat given to him by a student during a visit to Cuba's ELAM (Latin American School of Medicine) in Havana, Cuba, Tuesday, Jan. 28, 2014. Ban Ki-moon along with leaders from Latin America and the Caribbean are in Cuba to talk about poverty and inequality at a summit of a regional bloc formed as a force for integration and a counterbalance to the U.S. (AP Photo/Desmond Boylan) (The Associated Press)

This photo released by the United Nations shows Secretary General ban Ki-moon getting an impromptu haircut at Solon Correo in Old Havana, Cuba Monday Jan. 27, 2014. (AP Photo/United Nations, Mark Garten) (The Associated Press)

U.N. Secretary-General Ban Ki-moon attends the opening ceremony of the CELAC Summit in Havana, Cuba, Tuesday, Jan. 28, 2014. Ban Ki-moon along with leaders from Latin America and the Caribbean are in Cuba to talk about poverty and inequality at a summit of a regional bloc formed as a force for integration and a counterbalance to the U.S. (AP Photo/Adalberto Roque, Pool) (The Associated Press)

U.N. Secretary-General Ban Ki-moon has met with former Cuban leader Fidel Castro in Havana.

Ban's office tweeted that the two met for about 55 minutes Tuesday. The U.N. chief is in Cuba for a summit of the Community of Latin American and Caribbean States.

The U.N. office said it would provide details on the meeting shortly.

Ban met Monday with Cuban President Raul Castro, the younger brother of Fidel. Ban's office said the two discussed the U.S. embargo on Cuba and the human rights situation on the island.

Ban's office says it's his first visit to Cuba.

In her own tweet, Washington's U.N. ambassador, Samantha Power, urged world leaders visiting Cuba to meet with "everyday Cubans" and independent groups "to learn what's really happening & support democratic change."