Additional Sessions Judge Reetesh Singh allowed the prosecution's plea to extend the period of investigation against the accused persons -- Mohd Sajid, Shakir and Sameer, who are currently in the judicial custody.
The plea submitted that more time was required to complete the investigation in the matter.
The court had earlier sent the accused to the police custody on the prosecution's plea that their custodial interrogation was required to crack their Delhi module.
Special Cell teams had conducted raids in Delhi and UP in a joint operation of Delhi Police and a central intelligence agency.
All the three accused were suspected to be members of a sleeper unit of the terror outfit, police alleged.