Sources also claim that the e-mail sent by Bangladesh based terror group HuJI was traced back to Jammu and Kashmir and is being verified.
The Sept 7 Delhi High Court Blast left at least 75 injured and 11 dead. The case has been transferred to the NIA.
Police have also released the sketches of the two suspects who are believed to be around 26-year-old and 50-year-old.
It is suspected that a man wearing a white coloured shirt with a briefcase in hand carried out the medium intensity blast.