Azhar Iqbal, who was arrested from Madhya Pradesh by the National Investigation Agency (NIA), was produced before District Judge Amar Nath during in-camera proceedings and according to sources, NIA sought his custodial interrogation for 15 days.
They said NIA told the court that Iqbal was required to be interrogated to ascertain the identities of his other associates and know about their funding pattern.
The sources also said NIA told the court that the accused was required to be taken to various places in the country for the purpose of investigation.
On January 25, 12 ISIS suspects arrested from across the country were sent to 13 days in NIA custody after the court was informed that they were allegedly planning to carry out attacks ahead of the Republic Day.
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The 12 accused were Abdul Ahad, Imran, Mohd Afzal, Mohd Sharif, Mubabiir Mushtaq Sheikh, Mohd Alim, Syed Mujahid, Suhail Ahmed, Asif Ali, Njmul Huda, Mohd Obaidullah Khan and Mohd Hussain Khan, the sources said.
Earlier, two suspected terrorists -- Abu Anas and Nafees Khan, both aged 24 years -- were remanded to NIA custody for 13 days on the allegations that they had Islamic State links. They were arrested under several sections of the Unlawful Activities (Prevention) Act.