The main gas supply line to Narsingdi was damaged during construction work on a drain, according to Titas Gas authorities
The accident occurred around 9am on Wednesday on the Khagrachhari-Chittagong Highway in the Guimara Upazila, said local police OC Shariful Islam.
Police have not been able to identify the victims as yet.
The injured have been taken to the Manikchari Upazila Medical Complex for treatment.
“The bus was headed to Chittagong,” the OC told bdnews24.com. “Along the way the driver lost control of the vehicle and it overturned and fell into a ditch. The three died on the spot.”
Police and security forces personnel rescued the victims after being informed of the accident, OC Islam said.