A federal judge had ordered the government of the United States to release photographs showing the abuse of detainees in Iraq and other sites.
U.S. District Judge Alvin K. Hellerstein of the Southern District of New York granted the government 60 days to appeal.
The American Civil Liberties Union (ACLU) has been seeking to make the photographs public in the name of holding the government accountable.
"The photos are crucial to the public record," ACLU deputy legal director Jameel Jaffer said in a news release.
Jaffer added that their disclosure would help the public better understand the implications of some of the policies of the previous U.S. administration.
It is not clear how many photos are involved and where they were taken.
The fight over the photographs reaches back to the early years of the wars in Iraq and Afghanistan. In 2004, images of abuse of detainees by American soldiers at the notorious Abu Ghraib prison in Iraq led to international outrage.