The Islamic State is reportedly holding a Koran memorising competition which offers female slaves as the top prizes, according to an Isis advert believed to be from the northern Syrian state of Hasakah.

The Daily Mail says in addition to female slaves, cash rewards await the fourth and fifth prize winners.

The competition will be held in several Isis mosques in Syria, the newspaper reported. It is expected to take place over seven days, with the finals held on 27 June, as part of the Muslim fasting festival of Ramadan.

It said the top two prizes are described as "sabieah" the Arabic word for a female servant, who was originally taken after war from her home as a victory sign.

Women from the Yazidi tribe, a religious minority group, have frequently been reported to have suffered horrendous abuse at the hands of the Isis captives, the Mail said.

As much as 100,000 Syrian liras are being awarded for the fourth and fifth place for memorising extracts of the Koran, the newspaper said.