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An unnamed Tunisian woman who also travelled to Syria to join ISIS last year but later escaped, has told officials that she was kept in a house with 17-year-old Samra Kesinovic where they were forced to provide sexual services to ISIS fighters.

She said the girl had tried to escape several times, and after the last attempt, Samra had been beaten with a hammer so severely that she died from her injuries.

The Tunisian woman said they had lived together in the house and were regarded as a "sexual present for new fighters".

Express.co.uk understands Samra wrote to her family soon after arriving saying she wanted to leave because she was sickened by ISIS brutality, but she was unable to do so.