The National Investigation Agency, NIA has sought assistance from six countries, including the US, UAE and Canada, in its ongoing investigation against various suspected IS operatives and their terror activities in the country. <br/><br/>The probe agency disclosed this in its charge sheet filed before a Delhi Court against 16 suspected IS operatives. <br/><br/>These suspects were arrested from across the country allegedly on the charges of recruiting and financing people to join the terror group. <br/><br/>The agency claimed that these accused were trying to advance the cause of the terrorist organisation.