Russia marks day of mourning for concert hall victims, toll 137

US Intelligence Confirms IS Involvement With Deadly Moscow Concert Attack

US Intelligence Confirms , IS Involvement With Deadly , Moscow Concert Attack. On March 22, an attack on Russia's Crocus City Hall concert venue killed at least 137 people. . Associated Press..

WATCH: Flowers and rubble as Russia reels from Moscow concert attack

Sunday was a day of mourning in Russia for the victims of a horrific terrorist attack on a packed concert hall.

Moscow Attack: Russia mourns victims of concert attack, lowers flags to half-mast | Oneindia News

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..