The Trump administration deported 17 more gang members from the Tren de Aragua and MS-13 gangs to El Salvador, officials said Monday. The move is part of a bigger push to remove criminals from the U.S., even though critics have raised concerns over transparency and human rights issues.

The State Department said the deportations happened Sunday night. Officials claimed that the group included murderers and rapists but did not give details on their nationalities or crimes. However, El Salvador’s President Nayib Bukele’s office said that some of those deported were from Venezuela and El Salvador.

“These criminals will no longer terrorize our communities and citizens,” Secretary of State Marco Rubio said. “Once again, we extend our gratitude to President Bukele and the government of El Salvador for their unparalleled partnership.”

The deported men were flown to El Salvador on a U.S. military plane. A video from the Salvadoran government showed them arriving at a maximum-security prison. Once there, they changed into prison uniforms, had their heads shaved, and were marched into a cell block. Some of the men were seen kneeling on the floor with their wrists cuffed and ankles shackled. Guards held their necks, forcing them to move quickly while bent over. In the video, one man appeared to vomit on the floor while guards shouted instructions.

Earlier this month, the U.S. sent over 200 Venezuelans to El Salvador under similar circumstances. They are also being held in the maximum-security prison.

Trump’s administration has deported immigrants to various Central American countries, but El Salvador is the only one where they are being jailed. Bukele offered to detain anyone the U.S. wanted to deport, no matter their nationality, in a meeting with Rubio in February.

On Monday, Trump thanked Bukele, telling reporters, “I got elected on the basis of getting bad people out of our country that shouldn’t be here.”

Trump has warned that the Venezuelan gang Tren de Aragua is coming into the U.S. in large numbers. He used the Alien Enemies Act of 1798 to fast-track deportations. Before a judge blocked further removals under this law, the administration had already sent dozens of people to El Salvador. Now, the government is asking the Supreme Court to allow the deportations to continue.

The State Department, Department of Homeland Security, and Department of Defense, which managed Sunday’s removals, have not shared details about who was on the flight or under what legal authority they were deported.

Immigration and civil rights groups have criticized these deportations, saying people must be given a chance to argue that they could face persecution or torture in the country they are sent to. Lawsuits have been filed to challenge the use of the Alien Enemies Act.

A judge recently ruled that deported people must be given “a meaningful opportunity” to argue that being sent to another country is dangerous. On Sunday, the Trump administration appealed the ruling and provided new guidelines on how Homeland Security decides whether someone can be sent to a third country.

Anwen Hughes, a lawyer with Human Rights First, said her team is still trying to get more information about the Sunday deportations. She said that when people are sent back to their own country, they usually have family or friends to support them, but when sent somewhere else, they are left vulnerable.

On Monday, lawyers hired by the Venezuelan government to help deported Venezuelans in El Salvador said they had asked the country’s Human Rights Ombudsman to verify their clients’ whereabouts and conditions. The U.S. and El Salvador have not released the names of those deported earlier this month.

Lawyer Jaime Ortega said they also want to make sure the deported people are getting medical care if needed. Last week, the law firm filed habeas corpus petitions for 30 of the over 200 Venezuelans deported to El Salvador. When asked about the latest group sent on Sunday, they said they had no new information.

Ortega also said the U.S. has yet to provide proof that the prisoners are actually criminals.

In a separate decision on Monday, a federal judge temporarily blocked the Trump administration from ending legal protections for hundreds of thousands of Venezuelans. The protections were set to expire next week.