Prisoners spend 23.5 hours a day locked in their cells, with a brief, daily 30-minute window for exercise or religious activities in a central hallway.

The Trump administration and the president of El Salvador said they struck a deal allowing the U.S. to ship detained migrants and imprisoned criminals to a mega-prison there.

President Nayib Bukele has offered to jail deported criminals from the United States. His prisons have earned him a reputation as being tough on crime, but have raised alarms over rights abuses.