The Supreme Court on Tuesday received an anonymous email threatening to blow up the building, which prompted authorities to step up security.
The email was being verified and the source of the sender is yet to be identified.
Earlier this month, Justice Dipak Misra had received an anonymous threat in a letter that was found in the vicinity of his residence. Justice Misra was on the panel that refused to stop the hanging of 1993 blasts convict Yakub Memon on July 30.
The letter, which was found by security guards in the backyard of his home in Delhi, said in Hindi: "irrespective of the protection you have, we will eliminate you."
Speaking on the threat to Justice Dipak Misra, the Chief Justice of India, HL Dattu, had earlier said the SC had taken measures to deal with such threats.
"Our job is to decide the cases and we do it without fear," he had said.