A day after the Central Bureau of Investigation (CBI) arrested an Indian Railways Engineering Service officer and two others in an alleged graft case of Rs one crore, the agency on Monday continued its action as it arrested two more people taking the total arrests in the case to five, officials said.

The CBI arrested 1985-batch officer Mahendra Singh Chauhan, who was posted as Chief Administrative Officer (CAO)/Construction in North East Frontier Railways in Assam's Maligaon in one of the biggest traps in the history of the agency on Sunday from Guwahati. The agency sleuths also arrested Inra Singh, a private person and Bhupendra Rawat, an employee of the private company ABCI Infrastructures on Sunday from Dehradun, while exchanging the alleged bribe amount.