The National Investigation Agency Friday filed a charge sheet in a case related to alleged attempts to revive Sikh militancy with the ultimate objective of creating a separate 'Khalistan State'.

The Maharashtra ATS had registered a case in this regard in December last year, following which one Harpal Singh Naik from Pune was arrested, the NIA said in a press note. The Anti-Terrorism Squad (ATS) found a firearm and five bullets from Naik.