Ostyor () is a rural locality (a selo) in Roslavlsky District of Smolensk Oblast, Russia.Resolution #261, Territorial Units of Smolensk Oblast, Section Ostyorskoye Rural Settlement of Roslavlsky District of Smolensk Oblast, Line 1 Population:
Ostyor had a status of urban-type settlement until December 28, 2004, when it was demoted to a rural locality.
In August 1941, 300 Belarusian Jews arrived in Ostyor in order to extract peat. In September 1941, they were all murdered in a mass execution perpetrated by an Einsatzgruppen.
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