Nearly 200 photos of injuries sustained by detainees were released Friday evening by the Pentagon.

The images were released in response to a 2004 lawsuit from the American Civil Liberties Union, which has requested all 2,000 pictures be made public.

"The disclosure of these photos is long overdue, but more important than the disclosure is the fact that hundreds of photographs are still being withheld," ACLU deputy legal director Jameel Jaffer said. "The still-secret pictures are the best evidence of the serious abuses that took place in military detention centers."

The photos are in color as well as black and white, and all show bruises, cuts and other injuries to the arms, legs, backs, heads and midsections of prisoners.

All of the 198 images were part of federal investigations that found 14 substantiated allegations of abuse and 42 unsubstantiated ones, according to a statement from the Pentagon. Among the unsubstantiated cases, 65 service members were disciplined for their actions.

The Obama administration has promised to release the photos, but in 2009 Congress passed a law that gave the defense secretary the right to keep them classified if he or she deemed them a threat to national security.

Former defense secretaries Robert Gates and Leon Panetta issued bulk certifications for the photos, but last March, a U.S. district court judge declared that was insufficient.

Pentagon officials did not specify the exact locations or times the pictures were taken.