It was also discovered that some prisoners had their fingers broken while others had received electric shocks.
Ukrainian Police have confirmed the discovery of 25 Russian torture camps the eastern Ukrainian city of Kharkiv, which has been liberated from Russian control.
According to reports, the Russian army imprisoned and tortured civilians in the camps, regional police chief, Volodymyr Timoshko, wrote on Facebook on Monday.
It was also discovered that some prisoners had their fingers broken while others had received electric shocks.
The police chief also disclosed that 920 civilian bodies, including 25 children, had been found there so far.
Since Russia invaded Ukraine in a conflict that has lasted almost a year, Ukraine has claimed that Russian forces there have committed numerous war crimes.
Meanwhile, the most senior US general estimates that around 100,000 Russian and 100,000 Ukrainian soldiers have been killed or injured in the war in Ukraine.
Gen Mark Milley, chairman of the US Joint Chiefs of Staff, also suggested that around 40,000 civilians had died after being caught up in the conflict.
The estimates are the highest offered yet by a Western official.
He also said signs that Kyiv was willing to re-enter talks with Moscow offered "a window" for negotiations.
In November 2022, BBC reported that Ukraine signalled a willingness to hold some discussions with Moscow, after President Volodymyr Zelensky dropped a demand that his opposite number, Vladimir Putin, must be removed from power before negotiations could resume.
But speaking in New York, Gen Milley added that for any talks to be successful, both Russia and Ukraine would have to reach a "mutual recognition" that a wartime victory "is maybe not achievable through military means, and therefore you need to turn to other means.”