Rampage By Gunmen Kills Dozens At Moscow-Area Concert Hall

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.

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.

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.

Russian National Guard servicemen secure an area at the Crocus City Hall on the western edge of Moscow early on March 23.

The bodies of victims are seen outside the Crocus City Hall concert venue following the shooting.

A fire partially collapsed the roof after one of the gunmen reportedly threw an incendiary grenade or some other flammable device.