The first grave uncovered was west of the town's centre near the technical institute and contained 78 elderly women's bodies, the Sinjar director of intelligence, Qasim Samir, told The Associated Press. The second grave was uncovered about 15 kilometres west of Sinjar and contained between 50 and 60 bodies of men, women and children, he said.
More precise information from the second grave is unavailable at the moment, Samir explained, because the surrounding area is thought to be rigged with homemade bombs, preventing investigation teams from reaching it.
Kurdish forces backed by US-led airstrikes pushed the extremist group out of the town in a two-day operation last week.
"These people (in the mass graves) were shot and buried during the Daesh invasion last year," Samir said, using an Arabic acronym for IS. Sinjar was taken by IS militants in August 2014 following the earlier fall of Mosul.
During the same territorial push, IS advanced on Erbil, prompting the beginning of a US-led campaign of airstrikes against the group, first in Iraq and later in Syria.
"This is not a surprise," the official explained, requesting anonymity because he was not authorised to brief the media on the matter. "In other areas that have been taken back, we have found similar mass graves."
In the nearby town of Snuny, the Peshmerga uncovered 7 mass graves after retaking the territory earlier this year, the peshmerga official said.
Nawaf Ashur, a resident of Sinjar who was forced to flee with his family in August last year, said the news of the mass graves has jarred the Yazidi community.
While hundreds of Yezidi women and girls have been released or escaped IS captivity, human rights groups estimate thousands still remain in IS custody.
"But now with the news of each grave found, we know not all of them will come back," he said. "Some of them are never coming back.
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