Seven people were injured after the cylinder of a CNG-run auto-rickshaw exploded at Kulgaon under Bayzid police station in the Chittagong city early Sunday. The injured were identified as Alauddin, 24, Shahabuddin, 28, Raju Ahmed, 26, Jahangir, 25, Rabiul Islam, 26, Helal, 24, and the CNG driver Shahabuddin,