Cuba has begun setting free some of the 53 political prisoners it agreed to release as part of the historic thawing of ties, the US State Department announced on Tuesday.
Among them were the two brothers arrested in December 2012 in the eastern city of Santiago de Cuba, while protesting outside a police station to demand release of their older brother.
"The brothers Diango Vargas Martin and Bianco Vargas Martin have been released. This is 100 percent confirmed," Elizardo Sanchez, the head of the Cuban Human Rights and National Reconciliation Committee, told AFP.
The brothers were tried in 2013 for disturbing public order and violence against an officer, according to the commission.
Sanchez said the twins and their older brother, Alexei, are members of the opposition Patriotic Union of Cuba (UNPACU), which is active especially in the southeast of the Communist-run island.
UNPACU leader Jose Daniel Ferrer could not be contacted immediately by phone. But he confirmed on Twitter that three prisoner releases had been carried out in one day.
US President Barack Obama ordered his administration to initiate steps to normalize relations with Cuba last month in a deal that included the list of 53 political prisoners.
But critics have raised concerns about continuing abuses of human rights by the communist authorities on the island of 11 million. The government does not guarantee basic rights such as assembly and free speech; political parties other than the Communist Party are illegal.
The US State Department has said that as part of the process of normalizing ties with Cuba, the US would "continue to press the Cuban government to uphold its international obligations and to respect the rights of Cubans to peacefully assemble and express their ideas and opinions."
Neither the Cuban government nor official Cuban media have reported on Tuesday's releases.
