A Yazidi teenager who escaped ISIS sex slavery has said she was kidnapped and trafficked by the "new Jihadi John", British Muslim-convert Siddhartha Dhar.

Niham Barakat was just 16 when she and 27 members of her family were kidnapped by ISIS fighters after the fall of Sinjar, northern Iraq, two years ago.

She says she was beaten, raped and forced to marry a militant in Syria, before escaping, only to be recaptured and abused again, this time becoming pregnant.

"I was pregnant after the second rape," she said in an interview for a new documentary series, Hayat in Iraq, on the British Muslim TV channel.

"I tried to abort the child, but was unable to. My brother was with me and they said if anything happened to the baby they would kill us both.

"They told me I had to become a Muslim. I didn't want to have a baby that came from them and after what they had done to me."

London-born Dhar, who took on the name Abu Rumaysah after his conversion to Islam, is now one of the most senior foreign fighters in Mosul, according to Barakat.

He has been widely identified as the replacement for "Jihadi John" – Mohammed Emwazi – a British ISIS fighter who was killed in a drone strike in November 2015.

Baraket has named the jihadists who enslaved her, including Dhar.

The first man she was forced to marry was Abdul Salam Mahmoud, a notorious Australian extremist, a month and a half before he was killed in Syria.

Describing this initial capture, Baraket said: "They separated us into three groups, men, married women and single women, then took the single women and girls to Mosul.

"Sometimes they would come and take girls for their pleasure. They did everything to the girls."

She was beaten daily "for being Yazidi", and after Mahmoud's death, she took the opportunity to escape, but her freedom was short-lived.

"When I was captured near Kirkuk, they took me to another leader from Mosul. His name was Abu Dhar," she said.

"He also took Yazidi girls for himself. Every day he would tell me that I had to marry another man."

Although it is yet to be confirmed, her interviewer Joseph Hayat told The Independent that he was "very confident" Barakat was talking about the same Dhar.

"From the information I have, Dhar is deemed a leader in Mosul now, and she was very insistent on the name," he said.

"We asked her later if these were foreigners or ordinary Iraqis and she said they were foreigners.

"When we showed her pictures of Siddhartha Dhar she recognised them but went very cold," he said.

"She didn't want to go further and got very agitated."

Since her second escape, Barakat has been working with the AMAR foundation and is living in the Khanke refugee camp in northern Iraq.

"I managed to escape, but I had to leave the baby behind," she said, speaking at an AMAR event.

"It's not a life, we are not living a life until the rest of our people are released by Daesh."