Footage of gunmen reinforces terror group’s claim to have masterminded worst terror attack on Russia in two decades

• Moscow attack – latest updates

Islamic State has released new videos of the attack on the Crocus City concert hall outside Moscow that left 133 people dead, corroborating the terror group’s claim to have masterminded the slaughter even as Russia has sought to place the blame on Ukraine, which Kyiv denies.

The videos, which were published by IS’s news agency Amaq, showed the gunmen filming themselves as they hunted concertgoers through the lobby of the Crocus City Hall and fired at them from pointblank range, killing scores of people. At one point, one of the gunmen tells another to “kill them and have no mercy.”