The two graves were found on Friday near Badoush prison site in the northwest of Mosul, where one contained 470 bodies and the other contained 30, the Joint Operations Command (JOC) said in a statement.
The bodies are believed to be prisoners executed by Islamic State (IS) militants, reports Xinhua news agency.
The Badoush prison is known as the site of an IS massacre of more than 600 inmates on June 10, 2014, when the terrorist group was sweeping the northern province of Nineveh.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.