The July 18 stoning was the second in a span of 24 hours.
On Friday, Kamil Amin, the spokesman for Iraq's Human Rights Ministry, said hundreds of Yazidi women under the age of 35 are being held by the Islamic State group in schools in Iraq's second largest city Mosul, which the militants captured in June.
The stonings in Syria last month were not widely publicized at the time, but in the following days three photographs appeared online which appeared to document the grisly spectacle and were consistent with other AP reporting.
Bassam Al-Ahmad, a spokesman for the Violations Documentation Center, a Syrian group that tracks human rights violations, also confirmed the stoning.
An activist based in the northern province of Idlib, who collects information from other activists in northern Syria, said Ahmad was a widow.
The Hazm Movement, another rebel group active in northern Syria, said the stonings did take place.
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