Preliminary investigation showed Biswas was a propagandist of ISIS ideology and "has been instrumental in influencing minds against our friendly nations against whom ISIS is at war," the official said.
"His virtual or actual relations are under intense scrutiny. Investigation team is looking into every possible way of his connect with ISIS' virtual & actual world," Joint Commissioner of Police Hemanth Nimbalkar, who is heading the special probe team, told PTI.
Biswas, who was arrested here yesterday, has meanwhile been remanded in police custody for five days.
"Bengaluru CCB police got five days' police remand of Mehdi Masroor Biswas. He was presented before the Magistrate last night," DCP Crime Abhishek Goyal said.
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Police had yesterday said that 24-year-old Biswas has "confessed" that he was handling the pro-jihad tweeter "@ShamiWitness" that became a source of incitement and information for new ISIS recruits.
Meanwhile, Goyal has received a threat message in reply to his tweet about the arrest of Biswas.
"@goyal_abhei we will not leave our brothers in your hand Revenge is coming wait for our reaction," reads a replay from twitter handle @abouanfal6.
"Personally I'm not taking the threat much seriously, taking it in stride and not much alarmed," he said.