Silchar, June 26 -- The National Investigation Agency (NIA) on Friday filed a chargesheet against 11 alleged operatives of Bangladesh-based terror group Jama'atul Mujahideen Bangladesh (JMB).

The case stems from a multi-state operation led by Assam Police's Special Task Force (STF) in December last year, during which the 11 men were arrested from Assam, Tripura and West Bengal before the investigation was taken over by the NIA.

According to the central agency, they allegedly conspired to expand the extremist activities of its offshoot, Imam Mahmuder Kafila (IMK), in Assam, Tripura, West Bengal and other parts of the Northeast.

The chargesheet was filed before the NIA Special Court in Guwahati under various provisions of the Bharatiya N...