A case was registered by Nagpur police on Wednesday after Sayyed Talef Taji, descendant of Sufi saint Tajuddin Baba Aulia, received a letter threatening that he would be killed like Punjabi singer Sidhu Moose Wala, an official said.

The letter writer identified himself as 'Pappu Gujjar' from Jodhpur, Rajasthan, and claimed to be part of the gang which shot dead Moose Wala in May this year, he said.