Pakistan's Nobel prize winner's gravestone defaced in Rabwah

Abdus Salam may be Pakistan's first and only Nobel prize winner for his work in theoretical physics, but he was an Ahmadi and his gravestone has been defaced to remove the word Muslim.

The Ahmadi movement identifies itself as Muslim and follows the teachings of the Koran, but it is regarded by orthodox Muslims as heretical - because of its interpretation of certain Koranic writings.

Video produced by BBC Urdu's Nosheen Abbas.