The Islamic State group claimed responsibility for a gun attack on a Moscow concert hall on March 22, which Russian authorities said killed 62 people.
IS fighters “attacked a large gathering... on the outskirts of the Russian capital Moscow”, the group said in a statement on the Telegram messaging app.
The attack, which Russian authorities are investigating as terrorism, is the deadliest in Russia in recent years.
Several gunmen burst into the concert hall on the edge of Moscow and sprayed visitors with automatic gunfire, killing and wounding dozens and starting a massive blaze.
World leaders from across the globe condemned the attack.
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