The 10-minute recording describes the Yazidis, who belong to Iraq's Kurdish minority, as ‘true infidels’ who practice ‘rare rituals’ to worship the ‘cursed Satan’.

Earlier this month, tens of thousands of Yazidis fled to the mountains after the IS took the town of Sinjar in northern Iraq. The IS, which has made gains over the past weeks in northern Iraq, had warned Christians and Yazidis they should convert or leave as it seized their most important towns.

‘Now you are unfaithful, we will teach you the Shahada (Islamic profession of faith) and you are going to turn into Muslims,’ the Yazidis were told in the video.

After reciting the ‘Shahada’, the captives performed Islamic prayers as they chanted ‘Islam is the true religion and justice’. The International Federation for Human Rights (FIDH) called on the UN Security Council on Tuesday for urgent action in order to protect the Yazidi sect.

Thursday's video followed the release of another IS recording Wednesday showing the beheading of US journalist James Foley, who had been a hostage since 2012.

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