WASHINGTON, Oct. 12  Internal military documents released Thursday provided new details about the Defense Department’s collection of information on demonstrations nationwide last year by students, Quakers and others opposed to the Iraq war.

The documents, obtained by the American Civil Liberties Union under a Freedom of Information Act lawsuit, show, for instance, that military officials labeled as “potential terrorist activity” events like a “Stop the War Now” rally in Akron, Ohio, in March 2005.

The Defense Department acknowledged last year that its analysts had maintained records on war protests in an internal database past the 90 days its guidelines allowed, and even after it was determined there was no threat.

A department spokesman said Thursday that the “questionable data collection” had led to a tightening of military procedures to ensure that only information relevant to terrorism and other threats was collected. The spokesman, Maj. Patrick Ryder, said in response to the release of the documents that the department “views with great concern any potential violation” of the policy.