Accused Chandra Shekhar and Pradeep had submitted bogus police verification reports for getting gate passes for the refinery, they said.
Sub-Inspector CISF Virendra Kumar, who filed the FIR yesterday, said, "They had put fake seal and signature of the police to show authenticity of police verification."
The matter came to light when the Central Industrial Security Force (CISF) sent back the police verification reports for further verification.
Whether they had entered inside the refinery would be known only after thorough enquiry, police said.