"A civilian mass grave was found during a search near the village of Moglino in Pskov Region on June 17," the Search Movement of Russia said in a press release.
Nazi Germany set up a concentration camp for captured Soviet troops near the village after occupying the region in 1941.
Anna Shunyayeva, a volunteer working at the dig site, said the search party found bodies very close to where the camp was said to be. The remains were covered with a foot of soil. Two bodies have already been identified.
Researchers said that in 1942, Nazis started bringing civilians to the camp. A total of 3,000 people are believed to have lost their lives between 1941 and 1944. Berlin promised the territory to Estonia, and Estonian collaborators did most of the killing.