Civil rights attorneys are suing the Trump administration to prevent it from transferring 10 migrants detained in the U.S. to Guantanamo Bay, Cuba.

On Feb. 7, he and other Venezuelan men in ICE detention in El Paso were awakened and told they were going back to Venezuela, Purroy Roldan said. They were transported to Miami and put aboard a military plane – and realized they were actually going to Guantanamo.

The base had been cleared of migrants since Thursday, after the government sent 177 to Venezuela and one back to the United States.

A U.S. defense official confirmed to VOA that a C-130 military cargo plane carrying migrants left Fort Bliss in Texas and arrived at Guantanamo Bay on Sunday. A second defense official said all 17 migrants were assessed to be “high threat” and are being held at the base’s detention facility.

Nearly 200 Venezuelan immigrants to the U.S. were returned to their home country after being detained at Guantanamo Bay, in a flurry of flights that forged an unprecedented pathway for U.S. deportations.