The Department of Defense -- on the heels of the firestorm over the release of Bush-era memos on CIA interrogation techniques -- said Thursday it plans to make public at least 44 photos depicting potentially abusive treatment of detainees at prisons in Iraq and Afghanistan.

The decision to release the photos was announced Thursday in a letter filed in a federal court in response to a Freedom of Information Act lawsuit filed by the American Civil Liberties Union in 2004.

It sets a May 28 deadline for the Department of Defense to produce 21 images that the court in 2006 ordered the government to release and 23 additional related images, as well as "a substantial number of other images" in the Army's possession.

The images were part of the military's investigation of potential abuse of detainees by U.S. personnel at facilities other than Iraq Abu Ghraib, though the photos apparently aren't as shocking as those that set off a prisoner abuse scandal in 2004, the Los Angeles Times reports.

Even so, Defense officials say they worry that the new release of photos could set off a backlash in the Middle East against the United States, the Times reports.

The Bush administration had refused to disclose the images after the ACLU's request made in 2003, claiming that the public disclosure of such evidence would generate outrage and would violate U.S. obligations towards detainees under the Geneva Conventions.

The decision to release images comes on the same day that congressional aides said President Obama resisted pressure from Democrats to investigate Bush-era interrogation techniques, though Obama also has been under fire since last week from Republicans and former Bush advisers for releasing memos from 2002 and 2005 justifying the interrogation techniques used by the CIA.

The ACLU says making public additional images of detainee treatment is critical for helping the public understand the scope and scale of prisoner abuse as well as for holding senior officials accountable for authorizing or permitting such abuse.

"These photographs provide visual proof that prisoner abuse by U.S. personnel was not aberrational but widespread, reaching far beyond the walls of Abu Ghraib," said Amrit Singh, staff attorney with the ACLU. 

According to the Times, additional disclosures will include transcripts of detainee interrogations by the CIA, a CIA inspector general's report that has been kept mostly secret, and background materials of a Justice Department internal investigation into prisoner abuse.