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

The U.S. Homeland Security Department said on Tuesday a deportation flight carrying immigrants from different countries had landed in Eswatini, in a move that follows the U.S. Supreme Court lifting limits on deporting migrants to third countries.

On board the flight were five deportees from Vietnam, Jamaica, Laos, Cuba and Yemen who have been convicted of crimes ranging from child rape to murder, US Homeland Security Department Assistant Secretary Tricia McLaughlin said in an online post.