The central probe agency said it took over the case from the Kerala police, which had booked the five men in October.
The NIA case against the five was registered under the Unlawful Activities Prevention Act (UAPA)for "being members of the proscribed terrorist organisation, Islamic State of Iraq and Syria (ISIS)/Daesh, and for supporting the organisation by travelling out of India to join the terrorist organisation in Syria and fight on its behalf."
The five accused are -- Midhilaj (26), Abdul Rasak (34), Rashid M V (24), Manaf Rahman (42) and Hamsa U K (57).