The Supreme Court has received an anonymous email threatening an attack, according to the police. 

"The threat mail was received at the court's official email on Monday afternoon. The mail was written in English threatening to blow up court building after the recent judgement on Yakub Memon's hanging," IANS quoted police sources as saying.

Security checks have been tightened in the court premises and law interns have been barred from entering the court following the threat mail that was delievered to the SC's official email id –

"The security at the court complex has been beefed up. The case has been forwarded to the Special Cell and Cyber Cell who along with the district police are trying to trace the source of the mail," the sources said.

Security has been beefed up in and around the court premises.

Justice Dipak Misra, who headed the SC's three-judge panel that rejected 1993 Mumbai blasts convict Yakub Memon's last mercy plea, had also received a threat letter a few days ago.

The letter threatened to "eliminate" Justice Misra. "Irrespective of the protection you may avail, we will eliminate you," read the letter, which was found by his security guards in the backyard of his house.

Security was beefed up at Justice Misra's residence and he was provided with bullet proof vehicle.

The threat letter came days after Yakub was hanged to death at Nagpur Central Jail on 30 July for his involvement in the serial blasts in Mumbai on 12 March, 1993, which killed at least 257 people and injured thousands.

Fearing probable threat from Yakub's elder brother Tiger Memon, security was tightened outside the houses of the three judges -- Misra, Amitav Roy and Prafulla Pant -- soon after his execution.