Kizlyar–Pervomayskoye hostage crisis
The Kizlyar–Pervomayskoye hostage crisis, also known in Russia as the terrorist act in Kizlyar (Russian: Теракт в Кизляре), occurred in January 1996 during the First Chechen War. What began as a raid by Chechen separatist forces led by Salman Raduyev against a federal military airbase near Kizlyar, Dagestan, became a hostage crisis involving thousands of civilians, most of whom were quickly released.
Source: Wikipedia — Kizlyar–Pervomayskoye hostage crisis (CC BY-SA 4.0)