India, Nov. 6 -- A 47-year-old man was arrested for allegedly impersonating a vigilance department official appointed by Rashtrapati Bhavan and threatening the Faridabad chief medical officer (CMO) after barging into his office at Badshah Khan Hospital, police said on Thursday.

The suspect, identified as Rajinder Singh, a resident of Uttar Pradesh's Bulandshahr, had told officials that he was appointed by a Rashtrapati Bhavan official to investigate the Rs.50 lakh diesel scam involving National Health Mission (NHM) ambulances in Faridabad.

Registration numbers of four of these ambulances were found in logbooks, showing they had been ferrying patients repeatedly to various locations while they had turned into junk.

Police said the incid...