Social worker Estelle Thain told ITV News that she became increasingly concerned about one of the Peterborough victims when she became "too frightened" to speak about her experiences.
"It got to the point where we had to place her in foster care to move her away from Peterborough," she said, "which was where she was putting herself at risk."
"She had been moved a couple of months to foster placement, which was a long way from Peterborough, before she got to a point where she got comfortable to disclose some of the things that had been happening to her."
"She was 12 or 13 at the time," she added.
More top news
Journalists hoping to see a once-in-a-generation 'coronation' of leader Kim Jong Un were instead taken on a factory tour.
The votes are in and London's Mayoral candidates are now battling it out on the counting room floor. Keep up with the latest results here.
Belle Gibson rose to fame by claiming to have beaten brain cancer using a healthy diet and supplements - but later admitted it was all a lie