Cuba freed two more inmates, dissidents said on Thursday, as Havana began to release 53 people the United States considers political prisoners, as part of an agreement between the two nations aimed at ending decades of hostility.

Five detainees have been liberated over the past 24 hours, political opposition groups on the communist-led island said, including three others on Wednesday — all members of the dissident Patriotic Union of Cuba (UNPACU).

The commitment by Havana to free the prisoners was a major part of a historic deal announced last month, under which the two governments agreed to renew diplomatic relations after more than 50 years.