Hundreds of women and children were captured during the group’s bloody sweep through northern Iraq earlier this year and have since been trafficked as sex slaves , forced into marriage and imprisoned.

Victims who managed to escape told Amnesty International that many Yazidi girls killed themselves after losing hope of being saved.

A 20-year-old survivor, called Luna, said she was held with 20 girls as young as 10 in the Isis-controlled city of Mosul when they were told to dress up.

"One day we were given clothes that looked like dance costumes and were told to bathe and wear those clothes,” she added. "Jilan killed herself in the bathroom. She cut her wrists and hanged herself. She was very beautiful.

"I think she knew that she was going to be taken away by a man and that is why she killed herself.”

Another woman, 27-year-old Wafa, said she and her sister attempted suicide while imprisoned in Mosul after the man holding them gave them the choice of marrying him and his brother or being sold as slaves.

"At night we tried to strangle ourselves with our scarves,” she told Amnesty. "Two girls who were held with us woke up and stopped us and then stayed awake to watch over us.

"When they fell asleep at 5am we tried again, and again they woke up and stopped us. I could not speak for several days after that.”

Relatives of girls who managed to escape fear that the trauma will never leave them, reporting panic attacks and depression.

The grandfather of a 16-year-old girl who was raped in Isis captivity said: "She is very sad and quiet all the time. She does not smile anymore and seems not to care about anything. I worry that she may try to kill herself, I don’t let her out of my sight.”

Amnesty interviewed 42 women and girls for its report, "Escape from Hell”, which is being released today.

It chronicles the torture, rape and sexual violence suffered by women from the Yazidi minority. Women who converted to Islam were forced to marry Isis militants and those maintaining their faith have been trafficked as sex slaves, abused and imprisoned.

Videos have emerged online of horrifying "slave auctions” of girls in Mosul and Isis members have boasted of the abductions, justifying them by calling Yazidis "apostates”.

Thousands of people from the religious minority, who are viciously targeted by the Sunni extremist group because they are considered heretics, were driven from their homes in Sinjar by the Isis advance in August.

(independent.co.uk)