A mass shooting at a concert hall in Krasnogorsk, outside Moscow, killed at least 133 people with 145 others injured. Russian President Putin vowed to punish the perpetrators. U.S. officials believe ISIS-K was responsible for the attack. Putin accused Ukrainian authorities of aiding the assailants' escape.
Key Points
At least 133 people killed in mass shooting at concert hall
ISIS-K claimed responsibility for the attack
Accusations against Ukrainian authorities for aiding assailants' escape
Pros
Perpetrators have been arrested
Efforts to punish those behind the attack are underway
Cons
High death toll and injuries
Accusations of involvement by Ukrainian authorities