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.

The injured persons were admitted to the Government Medical College and Hospital here, they said. The Kranti Chowk Police have registered a case in this connection and further investigation is on.