The court also remanded Bhatkal and his aide Asadullah Akhtar to judicial custody till January 17 in a case lodged for the September 19, 2010 Jama Masjid terror attack.
Bhatkal and Akhtar were produced before the court after expiry of their police custody and the special cell of Delhi Police moved an application seeking voice sample of Bhatkal.
The police submitted before Additional Sessions Judge Daya Prakash that both the accused be remanded to judicial custody as they were not required for further custodial interrogation.
Khan alleged that the police was trying to frame Bhatkal as there were no recorded conversations with which the voice of his client was required to be matched.
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The court allowed the police's plea to take the voice sample of Bhatkal and remanded both the accused to judicial custody till January 17.
Bhatkal and Akhtar were in police custody till today in connection with the September 2010 Jama Masjid terror attack days before the Commonwealth games here.
It had said the pressure cooker bomb planted in the car had not exploded due to some circuit problem.
Earlier, the police had taken custody of both the accused in several terror cases, including the case relating to the firing incident at Jama Masjid's gate.