The NIA filed the charge sheet against Armar, Rizwan Ahmed, Mohsin Ibrahim Sayyed and Ayaz Mohammed before a special court here under various sections of Indian Penal Code and Unlawful Activities (Prevention) Act.
While Armar and Mohammed are absconding, the two others are in judicial custody.
The NIA said it found during the probe that Armar and his three accomplices hatched a conspiracy between July and December 2015 to "influence, instigate, motivate and radicalise the young vulnerable Muslim youth from Malwani area of Malad, Mumbai, to join the ISIS."
According to the NIA, Ayaz Mohammed went to Iraq via Afghanistan and joined the ISIS. He was in contact with Mohsin Ibrahim Sayyed and a few other youths from Malwani, whom he tried to radicalise and motivate to join the ISIS.
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Sayyed tried to spread his network and motivated youths to participate in the activities of the ISIS in India, and for this purpose, he was in close contact with Rizwan 'Nayab Ameer' of the organisation which was affiliated to the ISIS.
NIA said they prepared fake identity cards and used assumed names to conceal their identities. They extensively used different social media platforms like Facebook, Trillian, WeChat, Whatsapp, Surespot and Telegram, to communicate among themselves, besides exchanging e-mails.
The NIA said there was evidence to establish that Armar was the on-line handler in this conspiracy and was involved in motivating and radicalising the "vulnerable" Muslim youths all over the country.