During the Soviet occupation Lithuania lost about 800,000 residents. Many died as the result of hunger or exhaustion or were killed by the Soviet authorities. Deportation operations were held at the same time also in Latvia, Estonia, Ukraine, Belarus and Moldova.
Based on data from the Genocide and Resistance Research Center, from 1940-1958 every third Lithuanian became the victim of the Soviet genocide and terror.
Lithuania marks this Day by hoisting mourning flags and with many commemorating events.