According to Amnesty International, a Yazidi militia killed 21 Sunni Arabs in a January 2015 revenge attack, reports AFP.
Another 40 were abducted, 17 of whom are still at large.
The attack occurred on January 25th in two Sunni villages, Jiri and Sibaya, located in the Sinjar region of Iraq.
"Virtually not a single house was spared. Half of those killed were elderly or disabled men and women and children," Amnesty said in a report.
"We could not imagine the assailants would target the old and the sick but they did," a witness told Amnesty, describing how his 66-year-old father was shot dead in his wheelchair.
The Yazidis, a Kurdish religious group often subjected to abuse in Iraq, have been targeted by Daesh since last August.
Yazidi girls and woman captured by Daesh are often enslaved and raped by militants.
In December, Peshmerga fighters freed hundreds of Yazidis trapped in the Sinjar mountains. The Yazidis were beseiged there when Daesh made advancements in the Kurdish regions of Iraq.
More recently on May 3rd, Daesh reportedly executed as many as 600 Yazidi followers near Mosul..
