Crocus City Hall attack - Wikipedia

[Auto-translated] Four attackers associated with Islamic State – Khorasan Province (IS–KP or ISIS-K) carried out a mass shooting, as well as slashing attacks on the people gathered at the venue, and used incendiary devices to set the venue on fire.

[Auto-translated] On 25 March, Putin acknowledged that the attack was carried out by "radical Islamists", but suggested that Ukraine was somehow involved.

[Auto-translated] Alexander Bortnikov, the head of the FSB, said that "radical Islamists" prepared the attack with help from Ukrainian and Western "special services".