All the injured were rushed to nearby hospitals, said the official, adding that about "seven injured people succumbed to their injuries at the hospitals."
Officials believed that a gas leak-triggered explosion might have caused the incident.
Gas accidents are relatively common in Bangladesh.
In October, at least seven people including six children were killed when a gas cylinder exploded in the Bangladeshi capital of Dhaka.
In February, at least 81 people were killed as a devastating fire, triggered by a gas cylinder explosion, tore through a number of buildings in the old part of Dhaka. (Xinhua/ANI)