The bodies have not yet been exhumed and, hence, the precise toll is not known.
The Islamic State militants have carried out such mass executions, abducted girls as sex slaves and used child soldiers and these could amount to systematic war crimes in Iraq that demand prosecution.
In the opinion of the UN, the ISIS fighters had committed gross human rights violations of an 'increasing sectarian nature' against groups including Christians, Yazidis and Shi'ite Muslims in a widening conflict and, that has forced 1.8 million Iraqis to flee their homes.
Moreover, Iraqi government is also to be blamed because its air strikes on the Muslim militants had caused 'significant civilian deaths' by hitting villages, a school and hospitals in violation of international law.
The report also indicates that the IS attacked and killed female doctors, lawyers, among other professionals. Citing an instance of August, it said the ISIS had taken 450-500 women and girls to the Tal Afar citadel in Iraq's Nineveh region. Once there, 150 unmarried girls and women, predominantly from the Yazidi and Christian communities, were reportedly transported to Syria, either to be given as rewards to ISIS fighters or to be sold off as sex slaves.
