Nigeria's anti-human trafficking agency, Naptip, says that thousands of Nigerian women and girls have been tricked into travelling to Saudi Arabia, and then subjected to forced labour, torture and rape.

Naptip said that its staff had managed to interview about 50 girls during a recent visit to Saudi Arabia.

It said they had been tempted there by false promises of good jobs, only to have their travel documents confiscated on arrival, before they were forced to work in appalling conditions.

The agency said it was working with the Saudi authorities to try to secure their return.