Dozens of civilians were killed, most of them followers of the Yazidi faith, officials said as the Islamic State group fighters pressed their offensive against minority groups in the north.
Militants entered the village of Kocho yesterday and "committed a massacre," senior Iraqi official Hoshyar Zebari told AFP, citing sources from the region and intelligence reports.
"Around 80 of them have been killed," he said.
A senior official of one of Iraq's main Kurdish parties said 81 people had lost their lives, while a Yazidi activist said the death toll could be even higher.
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They hid there for days with little food or water.
Fear of an impending genocide against the Yazidi minority, whose faith is anathema to the Sunni Muslim extremists, was one of the reasons Washington cited for air strikes it began on August 8.
US President Barack Obama declared the Mount Sinjar siege over on Thursday but vulnerable civilians remain in areas taken by the jihadists, including Yazidi Kurds.
Human rights groups and residents say IS fighters have demanded that villagers in the Sinjar area convert or leave, unleashing violent reprisals on any who refused.
Mohsen Tawwal, a Yazidi fighter, said he saw a large number of bodies in Kocho.
"We made it into a part of Kocho village, where residents were under siege, but we were too late," he told AFP by telephone.
"There were corpses everywhere. We only managed to get two people out alive. The rest had all been killed.