Moscow attack: US, Canada warned Russia of imminent terrorism risk prior to shooting

At least 133 people are now known to have been killed in the terror attack at a concert hall on the outskirts of Moscow, although authorities say that number could rise. Russian President Vladimir Putin said Saturday that authorities had arrested all four suspects involved in the attack, claiming they had been captured while fleeing to Ukraine. Ukraine has denied any involvement in the attack. As Mike Drolet reports, the U.S. and Canada had both recently warned Russia about the risk of an imminent terror attack in Moscow. For more info, please go to Subscribe to Global News Channel HERE: Like Global News on Facebook HERE: Follow Global News on Twitter HERE: Follow Global News on Instagram HERE: #GlobalNews #moscow