A band's concert at Crocus City Hall in Moscow turned into a nightmare when armed men stormed in, firing indiscriminately and setting the hall ablaze. This tragic event, the deadliest attack in Russia in years, left 137 dead and over 180 injured. Despite initial speculation linking Ukraine to the attack, an affiliate of the Islamic State group claimed responsibility. Four suspects, Tajik nationals, were arrested and charged with terrorism, facing life imprisonment. The attack prompted a national day of mourning in Russia.