Aurangabad (Maha): Four passengers were injured today when a chemical parcel exploded in a state transport bus here, police said. Rajesh K Zhambad, the owner of Aurangabad-based business firm Vishal Enterprises, had allegedly packed some chemical illegally in the parcel saying it was educational literature to be carried to a college.

His employee Amol Sonawane was carrying the chemical parcel. As he was placing it in the Aurangabad-Paithan MSRTC bus, the parcel exploded, injuring four passengers, including Amol, police said.