Three persons were seriously injured as a gas-cylinder of a car blasted at a compressed natural gas (CNG) filling station in Chittagong’s Khulshi area on Sunday.Officer-in-Charge (OC) of Khulshi Police Station Md Nijam Uddin said, the car was waiting to refill gas when the explosion happened at 2:30pm.The OC added that the two injured, Sentu and Yusuf were admitted to city’s Holy Crescent Hospital, while the third victim, whose identity could not be known immediately, is undergoing treatment at a local hospital.