Moscow ? Workers rebuilding a 19th century Moscow house unearthed the remains of nearly three dozen people apparently dating back nearly 70 years – to the era of Soviet dictator Josef Stalin’s political purges, police said Thursday.

Police also found a rusted pistol on the estate where the remains of an estimated 34 people were found, some with gunshots to the head, police spokesman Yevgeny Gildeyev said.

The remains were found Wednesday under a basement of one of the estate’s buildings, and more could be found, he said. Investigators from the prosecutor’s office were trying to determine their identities.

The property was owned by a well-known czarist-era noble family, the Sheremetyevs.

The buildings are located in downtown Moscow, several hundred yards from the Lubyanka, the headquarters of the KGB, where some political prisoners were interrogated and executed.

In the 1930s, the Soviet Union experienced a wave of political killings and purges of the government and Communist Party orchestrated by Stalin’s secret police. The killings reached their apex in 1937 during what came to be known as the Great Terror. An estimated 1.7 million people were arrested in 1937-38 by security services alone, and at least 818,000 of them were shot.

Historians said the remains most likely were victims of Stalin’s political terror.

Arseny Roginsky, a Moscow historian and rights activist, said that in the early part of the 20th century, an adjacent building was home to a military conscription committee, while across the street was a military high court.

The military court “was perhaps one of the most important headquarters for judicial terror … of the 1930s and the ’40s, a most vivid time of murder when … the court actively condemned people to execution on a daily basis,” Roginsky said in televised comments.

Tamara Chakravadze, an elderly Moscow resident, said she went to the site on hearing news reports of the discovery, because her own relatives were victims of Stalin’s purges.

She said her father told her the estate used to be the site of a prison where people were held before being sent to labor and mining camps.

“My grandfather was killed and my father served an eight-year prison term in Kolyma when I was just a baby,” she told AP Television News. “That is why for me these bones are sacred, and there is no forgiveness for those who have not repented even today.”