MUSKOGEE, Okla. -- A Missouri man who said he was a U.S. Army captain and took command of rescue efforts after a deadly bridge collapse could be ruled incompetent to stand trial, his attorney said Wednesday.

A federal judge ordered William J. Clark to undergo psychiatric testing at a Fort Worth, Texas, medical center after a grand jury indicted him in August on charges of impersonating a federal officer and possession of a firearm by a convicted felon.

Clark, 36, of Tallapoosa, Mo., was arrested June 9 as he waited to board a ferry in Tobermory, Canada. He was turned over to U.S. authorities June 19.

"A doctor's recent preliminary statement would lead us to believe his opinion is Clark is not competent to stand trial," Clark's attorney, Paul Brunton, stated.