At least six persons sustained injuries after an explosion occurred inside a passenger bus near Shireen Jinnah Colony in Karachi, the provincial capital of Sindh, on October 20, reports Pakistan Today. South Zone Police officials confirmed that the explosion occurred due to ‘explosive material’ as no piece of the gas cylinder was recovered from the affected site. According to Police investigators, the explosive material was likely to be planted at the bus terminal and passing by passenger bus came into its range.