11 arrested in Moscow shooting; ISIS-K claims responsibility

Summary: Russia arrested 11, including 4 gunmen, linked to a shooting that killed 93 at a Moscow concert hall. ISIS-K claimed responsibility. President Putin was briefed by FSB chief. 145 were injured. The attack occurred before a Picnic concert. Security was heightened in Moscow. Foreign leaders condemned the attack. Earlier, a synagogue attack was foiled. US embassy warned of imminent threats in Moscow.

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