An Islamic court in Nigeria has permanently banned a rights group from holding an internet debate about amputation as a form of punishment.

This follows a temporary order made last week by a court in northern Nigeria preventing Facebook and Twitter being used to discuss the issue.

The ban was initially sought by a pro-Sharia group which said internet sites would be used to mock Islamic law.

The Sharia code runs alongside secular law in 12 of Nigeria's 36 states.