Additional Sessions Judge Daya Prakash sent Sultan to police custody for five days after the special cell of Delhi Police said he was required to be interrogated in connection with the serial blasts case.
55-year-old Sultan was earlier arrested here by National Investigation Agency (NIA) in connection with a separate case of waging war against the country.
The special cell had recently chargesheeted 29 suspected top IM operatives, including its co-founders Yasin Bhatkal, Riyaz Bhatkal and Iqbal Bhatkal, in two separate cases of September 13, 2008 serial blasts here.
Out of the 29 accused, 16 accused, including Yasin Bhatkal and his close aide Asadullah Akhtar, have been arrested by the probe agencies while 11 others are absconding.
Two of the chargesheeted accused -- Mohd Atif Ameen and Mohd Sajid -- were shot dead by the special cell in the September 19, 2008 Batla House encounter.
13 suspected members of IM are facing trial in cases of September 2008 Delhi serial blasts that had claimed 26 lives and left 135 people injured.
All the five cases were clubbed by the trial court for the purpose of framing of charges and trial, saying, "They arise from the series of the same transaction.
