Here's What We Know About the Moscow Concert Hall Attack
Briefly

At least 115 people were killed and more than 140 injured Friday night in an attack at a popular concert venue near Moscow, the deadliest act of terrorism in the Russian capital in more than a decade.
American officials have attributed it to ISIS-K, a branch of the group active in Iran and Afghanistan. Russian officials have not commented on the claim.
Read at www.nytimes.com
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