Justice Misra received the letter at his New Delhi residence after which he lodged a complaint at the Tughlaq Road Police Station. Memon was hanged on July 30 after the Apex Court Bench comprising Justice Dipak Misra, Justice Prafulla C Pant and Justice Amitava Roy post-midnight rejected Memon's plea seeking 14 days' time before the execution of his death sentence.

"We have registered a case on the basis of the Judge's complaint. We are scrutinising the letter to verify its authenticity. We are also finding out if its a prank played by someone or is circulated by the associates of Memon," police sources told.

Senior police officials could not be contacted for a comment despite repeated attempts and some of them denied commenting saying 'it is a very sensitive matter and is under probe'.

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