'Won't Spare Anyone': Russia's New Chilling Threat; Putin Aide Says 'Just Wait...' | Moscow Attack

Russia has once again issued a chilling threat to those involved in Friday's horrifying attack on Moscow concert hall that killed more than 130 people. President Vladimir Putin's close aide and deputy chair of Russian Security Council Dmitry Medvedev said that they won't spare anyone involved in the attack. While the Islamic State group had claimed responsibility for the militant strike on the outskirts of the Russian capital, Russia has been seeking to tie the attackers to Ukraine. Watch the video for more.