ISIS Claims Responsibility for Moscow Concert Hall Attack, Contradicting Russian Allegations

Iran had warned Russia of a potential terrorist threat prior to the attack, which left over 130 dead.

Iran warned Russia of a potential major terrorist operation before the deadly attack on Crocus City Hall.
ISIS claimed responsibility for the Moscow attack, which resulted in over 130 deaths, contradicting Russia's allegations against the US, Ukraine, and Great Britain.
Experts and international responses highlight the lack of evidence supporting Russia's claims of Western and Ukrainian involvement in the attack.
US intelligence supports ISIS's claim, and footage from the attack matches ISIS propaganda.
The Moscow attack raises questions about the effectiveness of Russian security services despite prior warnings.