Ukrainian authorities have found a mass grave in the recently liberated eastern town of Lyman and it is unclear how many bodies it holds, regional governor Pavlo Kyrylenko said in an online post on Friday. Separately, the Ukrinform news agency cited a senior police official as saying the grave contained 180 bodies. Ukrainian troops retook Lyman, in the Donetsk region, from Russian control on Saturday. Ukrainian authorities have regularly accused Russian troops of committing atrocities in occupied territories, a charge Moscow denies.