El Shukrijumah's connection to the dirty-bomb plot is based on his stay in southern Florida at the same time as another al Qaeda suspect, Jose Padilla.
Padilla is a Muslim convert who was arrested in May 2002 in Chicago after returning from Switzerland. He was detained as an enemy combatant and transferred to U.S. military custody.
Padilla has not talked to U.S. officials, but intelligence agencies believe he and El Shukrijumah were conspirators in the bomb plot.