Authorities have removed U.S. immigrants from detention facilities at Guantanamo Bay as a federal court in Washington weighs a challenge by civil rights advocates to holding immigrants at the offshore military station.

The United States has cleared out the last migrants being held at its naval base at Guantanamo Bay, Cuba, sending them back to the U.S. mainland as they await deportation. Two U.S. defense officials told VOA on Wednesday that 40 detainees,

All of the remaining migrants being held at Guantanamo Bay in Cuba have been moved to Louisiana over the last two days, according to a U.S. official.

U.S. immigration and military authorities say that immigrants from 27 countries were being held at Guantanamo Bay Naval Station in Cuba, while revealing new details of conditions of confinement and defending the government’s authority to transfer and hold immigrants to the military base.