The United States has deported several migrants to the Central African Republic under a controversial agreement that allows Washington to deport migrants who cannot be returned to their countries of origin, Deutsche Welle reports.

According to the publication, a flight carrying more than 20 migrants departed from Louisiana on Thursday evening. Among those on board was an Iranian pro-democracy activist.

Ali Rahnama, acting executive director of the Iran-American Legal Defense Fund, said that the flight also included citizens of Jordan, Armenia, Turkey, Georgia, and Afghanistan.

The aircraft landed in Bangui, the capital of the Central African Republic. A source close to the U.S. Embassy told the Associated Press that some of the migrants were temporarily housed at a firefighter-rescue base near the embassy compound, which is currently under construction, while others were accommodated at different locations.

The administration of President Donald Trump has signed several agreements with countries in Africa and Latin America that allow the deportation of third-country nationals who cannot be returned to their home countries. Human rights groups have argued that the legality of these agreements is highly questionable, while Washington maintains that they are legally justified.