The National Investigation Agency on Wednesday filed a supplementary chargesheet against three operatives of the banned Babbar Khalsa International in a case related to seizure of arms, ammunition and improvised explosive devices in Haryana last year, an official said.

The chargesheet against Akash alias 'Akashdeep', Sukhbir Singh alias 'Jashan' and Jarmalpreet was filed before a special court in Panchkula under sections of the Indian Penal Code, the Unlawful Activities (Prevention) Act, the Arms Act and the Explosives Substances Act, a spokesperson of the federal agency said.