"We are aware of the identity of the three persons who planted the explosives. We know them by their code-names, may be they are not in the country now," he said at the annual press conference.
Paul said six persons have been arrested so far in connection with last year's serial blasts. Three persons have been arrested for hatching the conspiracy, while three others have been held for funding the operation. Of the six arrested, two had undergone narco-analysis test in Bangalore and their revelations have indicated that the investigation in on a proper track, the police commissioner said.
Deadly blasts rocked Delhi on October 29 at Paharganj, Sarojini Nagar Market and Govindpuri in which over 65 people were killed and nearly 200 injured. Paul claimed Lashkar-e-Tayiba terrorists hatched the conspiracy.