Mourners flocked to Crocus City Hall, paying their respects and bringing flowers to the 6,200-seat concert hall outside Moscow, where four armed men burst in on Friday, just before Soviet-era rock group Picnic was to perform its hit "Afraid of Nothing."

Russia lowered flags to half-mast on Sunday for a day of mourning after scores of people were gunned down with automatic weapons at a rock concert outside Moscow, in the deadliest attack inside Russia in two decades.

President Vladimir Putin declared a national day of mourning after pledging to track down and punish all those behind the attack, which left 133 people dead, including three children. More than 150 people were injured.

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