The Supreme Court has received an anonymous email threatening that it will be blown up, according to the sources. The threatening mail was received last weekend after which the security has been tightened and anti-sabotage checks have been increased in the court. On August 5, Supreme Court Justice Dipak Misra who had rejected Mumbai blasts convict Yakub Memon's mercy plea had received an anonymous threatening letter. Security outside his residence was quickly beefed up after the threat letter was sent to his office at the Supreme Court recently.