Vladimir Putin failed to acknowledge the intelligence warning provided by American services regarding the attack from Islamic State, resulting in a significant intelligence failure. Despite being forewarned, the attack still occurred, raising questions about the Russian intelligence capabilities. The attackers, four suspected gunmen, have been caught and put on trial in Moscow. They have pleaded guilty, but there are signs of physical abuse on them. Two of the attackers are reported to be tagiques, individuals from Central Asia living in Russia. Islamic State has claimed responsibility for the attack, adding to the complexity of the situation.