Moscow theater hostage crisis
The Moscow theater hostage crisis, also known as the 2002 Nord-Ost siege, was the seizure of the crowded Dubrovka Theater in Moscow by Chechen terrorists on 23 October 2002, resulting in the taking of 912 hostages. The attackers, led by Movsar Barayev, claimed allegiance to the rebel breakaway movement in Chechnya.
Source: Wikipedia — Moscow theater hostage crisis (CC BY-SA 4.0)