A Marine Corps attorney at Camp Pendleton says government criminal investigators raided defense counsel offices and opened case files during a 2½-hour search that could compromise scores of military criminal cases if confidential and privileged information was seen.

Lt. Col. Clay Plummer told The Associated Press on Friday that investigators raided the offices last week in search for a cell phone tied to a case being tried at the base, north of San Diego. Plummer oversees all Marine Corps defense lawyers for the western U.S.

Marine Corps spokesman Jeffrey Nyhart says it was a rare but lawful and valid search. He says he was working on getting details of the circumstances.

Plummer says the raid is unacceptable and his lawyers will be filing motions with the courts against the action.