Putin's Big Pledge After U.S. Links To Moscow Attack Claims; 'Will Dig Out And Punish...'

Russian President Vladimir Putin took a pledge on Tuesday over the Moscow attack case. Putin has vowed to find all the perpetrators, their links, and the beneficiaries of the attack. He said this at an expanded meeting of the board of the Russian Interior Ministry. Putin's pledge comes amid claims that the U.S. and Ukraine are linked to the deadly terror attack. Russia has launched an investigation into possible U.S. links to Moscow attacks. The probe was launched after a complaint with "credible information" by Russian lawmakers.