Teen arrested after threatening 'Columbine 2.0' at Newmarket elementary school

Clearmeadow Public School in Newmarket, Ont. is shown in a Google Streetview image. Clearmeadow Public School in Newmarket, Ont. is shown in a Google Streetview image.

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NRA opens gun convention in Texas after school massacre

The National Rifle Association begins its annual convention in Houston on Friday, and leaders of the powerful gun-rights lobbying group are gearing up to "reflect on" -- and deflect any blame for -- the deadly shooting earlier this week of 19 children and two teachers at an elementary school in Uvalde, Texas.