Five immigrants deported by the United States to the small southern African nation of Eswatini under the Trump administration’s secretive third-country program are in prison, where they will be held in solitary confinement for an undetermined time.

The Trump administration sent five deportees to Eswatini, an African kingdom, saying that their own countries would not take them. But Eswatini says it will send them home.

Eswatini faces backlash after accepting US deportees with criminal records, sparking outrage across Africa over sovereignty, safety, and secretive deals.