Seventeen alleged Tren de Aragua and MS-13 gang members deported from the US were flown in shackles to an El Salvadoran tarmac Sunday night, where they were met by heavily armed Salvadoran troops.

The U.N. human rights commission's working group has now said it will appeal to El Salvador to consider the recent deportation and imprisonment of Venezuelans “alleged enforced or involuntary disappearances” cases.

The Trump administration said the men accused of being MS-13 and Tren de Aragua members were sent to El Salvador as part of a “counterterrorism operation.”