Adnan Hussain, who hails from Karnataka, Mohammad Farhan, from Maharashtra, and Sheikh Azhar Al Islam, from Jammu and Kashmir, were arrested by NIA after registering a case in New Delhi, official sources said.
The report said that a total of 23 Indians have so far joined the IS of which six were reportedly killed in different incidents.
The hour-long meeting, also attended by National Security Advisor Ajit Doval and senior home ministry officials, apprised the Muslim clerics about activities of the West Asian terrorist group and its efforts to attract Indian youth to its fold.