TEHRAN A Canadian high school has banned students from wearing black trench coats similar to those worn by the killers responsible this week for the worst school massacre in U.S. history, Reuter reported from Toronto. Officials at Fredericton high school in the province of New Brunswick imposed the ban after several students wore black trench coats in apparent mockery of a massacre at columbine high school in Littleton, Colorado. Fifteen people died at the U.S. school after two students, both members of a clique dubbed the "trench coat Mafia," went on a killing spree before committing suicide.

Both wore long black trench coats.