ABIDJAN, Ivory Coast — Up to 10 new mass graves have been discovered near the site of a July attack on a camp for displaced people, officials said Tuesday, amid allegations that initial casualty totals were downplayed to mask killings carried out by the national ­army.

Rights groups claim summary executions were carried out by the Republican Forces of ­Ivory Coast. Last month, officials found six bodies in a well close to the former campsite in the western town of Duekoue.