The gang, claiming to be members of Janhit Kranti Party from adjoining Chattisgarh, arrived at the company's construction site at Gariajor on Wednesday night and demanded five per cent of the project cost as levy, police said.
The gang members fired in the air triggering panic among a dozen of employees present and snatched a mobile phone of one of the employees, police said.
They were demanding levy in the name of one Brijraj Nagesia.
A case has been registered in this connection on the statement of the employees, sources said.
Superintendent of Police Rajeev Ranjan said the name of the organization featured for the first time in the district.