The bodies of several people whose hands were tied behind their backs have been found in the Kyiv region of Ukraine.

It comes as Ukrainian police investigate the killings of more than 12,000 compatriots nationwide during Russia’s war.

“Shots to the knees tell us that people were tortured,” said Andriy Nebytov, head of the Kyiv regional police.

“The hands tied behind the back with tape say that people had been held (hostage) for a long time and (enemy forces) tried to get any information from them.”

Since the withdrawal of Russian troops from the region at the end of March, the authorities say they have uncovered the bodies of 1,316 people.

One site reporters saw on Monday was a mass grave in a forest near Bucha, where the horrors of war shocked the world after a regional Russian withdrawal earlier in the war.

Reporters on Monday saw a mass grave just behind a trench dug out for a military vehicle.

The bodies of seven civilians were retrieved from the mass grave.

Two were found with their hands tied and gunshot wounds to the knees and the head, Mr Nebytov said.

Nationwide, police chief Igor Klimenko told the Interfax-Ukraine news agency on Monday that criminal investigations into the deaths of more than 12,000 Ukrainians included some found in mass graves.

He said the mass killings of people resulted from snipers firing from tanks and armoured personnel carriers.

Bodies were found lying on streets and in their homes, as well as in mass graves.

He did not specify how many of the more than 12,000 were civilian and military.

Complete information about the number of bodies in mass graves or elsewhere is not known, Ukrainian President Volodymyr Zelensky told the American Jewish Committee on Sunday.

He cited the killings of two children who died with their parents in the basement of an apartment building in Mariupol in a Russian bombing.

Mr Zelensky, who is Jewish and lost relatives in the Holocaust, asked: “Why is this happening in 2022? This is not the 1940s. How could mass killings, torture, burned cities, and filtration camps set up by the Russian military in the occupied territories resembling Nazi concentration camps come true?”