Footage of four gunmen appears to support Islamic State’s claim that it masterminded the worst terrorist attack in Russia in two decades. But the Kremlin has put Ukraine in the frame. Andrew Roth reports
The attack on Crocus concert hall near Moscow was the worst act of terrorism carried out in Russia in more than 20 years. More than 130 people were killed after gunmen stormed the venue on Friday night.
Islamic State quickly claimed responsibility for the attack and provided additional video footage of the massacre.
