Support worker Heidi Wiedeman said some of the men had used what was sometimes called the "loverboy" technique, slowly building up a sense of trust and making the girls believe they were in a relationship before pressurising them into sexual acts, first with the abuser himself and then with other men.

BBC: Telford faces up to child sex abuse cases

In court, Chagas said he had been the victim of sexual abuse when he was a child, and that the memory of his abuser had driven him to kill.

BBC: Chagas will stand trial for other killings early next year