Gunmen opened fire at a crowded concert hall on the outskirts of Moscow on the evening of March 22, killing at least 133 people and wounding many more. The Islamic State militant group claimed responsibility. It was the deadliest terrorist attack in Russia since the 2004 Beslan school hostage crisis, in which more than 330 people were killed.
Rampage By Gunmen Kills Dozens At Moscow-Area Concert Hall
- By RFE/RL

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In this photo taken from video released by the Investigative Committee of Russia on March 23, a Kalashnikov assault rifle lies on the ground at the Crocus City Hall concert venue after the attack.

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Members of the emergency services work at the scene of the attack at the Crocus City Hall concert hall in Krasnogorsk, outside Moscow, on March 23.

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In this photo taken from video released by the Investigative Committee of Russia on March 23, investigators work at the scene after the mass shooting at the Crocus City Hall concert venue the evening before.
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
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Russian National Guard servicemen secure an area at the Crocus City Hall on the western edge of Moscow early on March 23.

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The bodies of victims are seen outside the Crocus City Hall concert venue following the shooting.
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A fire partially collapsed the roof after one of the gunmen reportedly threw an incendiary grenade or some other flammable device.
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