A 49-year-old male Australian witch who turned teenage girls into sex slaves has turned his attention to Ghana.

Robin Angas Fletcher finished an eight-year jail term in June, but has been living in a unit inside the walls of Ararat prison, in western Victoria, Australia, under an extended supervision order imposed by the Adult Parole Board.

Fletcher challenged the conditions of the order, imposed under the Serious Sex Offenders Monitoring Act, in the Victorian Supreme Court. A judge ruled the Board was acting unlawfully by keeping Fletcher behind prison walls after he had completed his jail term.

Fletcher was due for release earlier this year, but parole was refused after authorities discovered he engaged in "disturbing" correspondence with people in Ghana, West Africa.

In an advertisement on a prisoner pen-pal site, he claimed to be a real witch and an occult and bondage and discipline master.

Fletcher used hypnotism and mind-altering techniques to entice two 15-year-old girls into prostitution, sadomasochism and black magic.

He was jailed in 1998 after pleading guilty to prostituting a child, sexual penetration, and indecent acts against a child aged under 16.