A teenager charged with belonging to a terror cell that planned attacks in southern Ontario pleaded not guilty on Tuesday in the first trial related to an alleged 2006 plot. Authorities announced the arrest of 17 suspects in June 2006 after they allegedly tried to obtain three tons of ammonium nitrate. They accused the suspects of plotting terror attacks in Canada and said they were inspired by al-Qaida. One defense lawyer has said his client and some of the other suspects were charged with plotting to attack Parliament, take hostages and possibly behead the prime minister if their demands for the release of Muslim prisoners were not met. His comments caused widespread concern and heightened terrorism fears in Canada.