Putin vows to find the masterminds of Moscow concert hall attack

Russian President Vladimir Putin (Pavel Bednyakov, Sputnik, Kremlin Pool Photo via AP)

President Vladimir Putin has vowed to track down the masterminds of the Moscow concert hall attack that left 144 people dead, and urged law enforcement agencies to tighten security at mass gatherings.

Mr Putin has repeatedly sought to link the March 22 killings to Ukraine and the West despite the Islamic State group’s claim of responsibility and Kyiv’s vehement denial, as well as a US government warning to Moscow days earlier of an imminent attack.