Construction workers in Siberia have uncovered a mass grave that may contain the bodies of hundreds of victims of Josef Stalin's bloody purges in the 1930s, the Tass news agency said Friday.

Tass said the find was at Gorno Altaysk about 250 miles southeast of Novosibirsk in the heart of Siberia. The bodies were found in 61/2 feet of earth and there appeared to be several more layers of graves.The report said preliminary medical observation of the remains of 50 people showed they had been shot at close range, either through the back of the head or the temple.