The article reports on the shooting at the Crocus City Hall concert venue on the outskirts of Moscow, Russia that killed and wounded civilians, which the Islamic State (ISIS) claimed responsibility. It shows the response of the Russian national guard and the Russian Investigative Committee to the terrorist attack, which came on a day when missiles and drones attacked Ukraine. It informs about the security alert issued by the U.S. Embassy in Moscow warning of potential attack by extremists.