17-year-old former student charged with attempted murder after Lester B. Pearson lockdown  CTV News17-year-old charged with attempted murder of Calgary high school student  Global News17-year-old charged with attempted murder following Thursday incident at northeast Calgary high school  Calgary HeraldFormer Lester B. Pearson student charged with attempted murder at Calgary high school  CBCCalgary police charge teen with attempted murder after NE high school lockdown  CityNews Calgary