The investigating agency, in its remand application filed before a magistrate today, contended that Riyaz being an active member of banned outfit Indian Mujaheedin (IM) could provide some useful information on the attack.
Riyaz, who was arrested from Vadodara last month was produced before magistrate V J Kalotra at his residence, after his previous remand in the Khadia blast case ended today.
Magistrate Kalotra sent Danish to 11-day custody of the city crime branch in the Civil Hospital blast case after the investigating agency sought a 14-day remand.
The crime branch contended that Danish was an active member of IM and was in touch with other absconding accused of the 2008 serial bomb blasts case before he was arrested.
Danish, being an active member of the IM, could provide information about the Mumbai blast, the agency added.
Public Prosecutor Mitesh Amin said Danish had sent emails to another accused in the Ahmedabad blasts case Faizal, who was arrested by the Madhya Pradesh police last month. These emails are in a coded language and Danish needs to be questioned regarding it, Amin said.