WASHINGTON (Reuters) – Cuba has freed some of 53 people the United States regards as political prisoners, as agreed under last month’s U.S.-Cuban rapprochement, the U.S. State Department said on Tuesday in its first public acknowledgement that some detainees have been released. The lack of information about the fate of the detainees, who President Barack Obama’s administration has refused to identify by name, has provided ammunition for congressional critics of Obama’s restoration of ties to Havana. “They have already released some of the prisoners. …