New Delhi, Aug. 21 -- The Delhi Police has registered an FIR into a blast at a fuel station in Tikri Kalan that took place while a CNG-run truck was being refuelled on Wednesday, which left three people dead, with an initial probe revealing that the truck was fitted with more than the permitted number of cylinders, officers aware of the matter said on Thursday. Police said that they are also questioning the dealer who runs the fuel station and his staffers in connection with the case. Senior police officers said multiple inspections of the site, truck and equipment have taken place. "The cause of the blast is still not clear but our local staff and IGL [Indraprastha Gas Limited] team informed that the truck, which has authorisation to only ...