The PCR command room informed police regarding the call at 4.48 pm, they said, adding that the train was scheduled to leave for Mumbai at 4.55 pm. An Indian Air Force officer was on Saturday arrested for allegedly making a hoax bomb call to delay the departure of Mumbai Rajdhani Express from New Delhi Railway Station, police said. “The mobile number was tracked and it was found that Sunil Sangwan (35), a Sergeant in the Indian Air Force, made the call,” Deputy Commissioner of Police (Railways) Hareesh H P said.