Around 300 Yezidi captives have been killed by Islamic State near Mosul, according to a statement from the Yazidi Progress Party.
Thousands of Yazidis were captured by IS militants last year, when they took over huge swathes of land in northern Iraq.
The Yazidi Progress Party's statement, quoted by the Kurdish Shafaq News website, condemned the killings as a "heinous crime" and urged Iraqi forces to free those still held by the militants.
See more here.