The preliminary FBI investigation has determined that an explosive found in the apartment of a man accused of setting off a pipe bomb outside an Oklahoma military recruiting office had unusual features more common outside the U.S.
The Tulsa World reports that a pipe bomb allegedly found in Benjamin Roden's apartment utilized two 9-volt batteries and magnets. A government affidavit says the device's features were "unusual for Oklahoma" and "typically seen in other parts of the world."