An FIR has been registered against a man, accused of cyber fraud worth around Rs 3,700 crore and presently lodged in jail, for allegedly sending a threatening email to an Allahabad High Court judge using a police constable's phone, police said on Sunday.

According to an official, Anubhav Mittal, accused of duping nearly seven lakh investors to the tune of Rs 3,700 crore through a bogus online trading scheme and currently lodged in Lucknow jail, allegedly sent the email under a fake name to frame another inmate.

The message warned that a judge of the Lucknow bench "was going to be murdered," the official said, adding that an inquiry by the Cyber Cell and Crime Branch revealed that the email originated from constable Ajay Kumar's phone.

"A case has been registered against Anubhav Mittal a

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