An Islamic civil rights group said it wrote to Defense Secretary Donald H. Rumsfeld objecting to the practice, which it said may violate international laws of war, and urging the Pentagon to bring it to an end.

"This disgusting trade in human misery is an insult to all those who have served in our nation's military," Arsalan Iftikhar, legal director for the Council on American-Islamic Relations, said in his letter to Rumsfeld.

Bryan Whitman, a spokesman for Rumsfeld, said the Pentagon had recently become aware of Internet postings and is looking into it.

"Obviously, it is an unacceptable practice," Whitman said.

An Army spokesman, Col. Joseph Curtin, said the Criminal Investigation Division recently began investigating the matter on behalf of Lt. Gen. John Vines, commander of the Multinational Corps in Iraq.

Another Army spokesman, Paul Boyce, said later that the preliminary criminal inquiry determined, based on available evidence, that felony charges could not be pursued. But the matter, including the possibility of disciplinary action, was being handled in coordination with other military services, he said.

Many of the photos depict dismembered Iraqi corpses and body parts. Some also were submitted by soldiers in Afghanistan.

Sound Off...What do you think? Join the discussion.

Copyright 2012 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

More Military Headlines

• Socom Refines AC-130J Gunship Plans
• TV: Women Fare Badly in Super Bowl Ads
• Senate Won't Order McChrystal Testimony
• Iraq, Afghan Refugees Start Over in US
• No Young Soldiers