[headsonpikes]

They figured out that he was Canadian when he shouted, "Death to the Infidels, eh!"

[GMMAC]

Yeah that & along with ...
"Identification belonging to Rasoul — including his driver's licence, social insurance card and a laminated card for Toronto sporting goods store— were found after a U.S. attack on an Ansar stronghold near the border of Iraq."
... as well as several telltale empty Tim Horton's cups, three uncashed welfare cheques & a receipt from Canadian Tire for a combination GPS unit & fish-finder.