At least four labourers were killed and six others injured when roof of a factory collapsed after a boiler exploded in Akbarabad area here in wee hours of Saturday.

According to rescue sources, a boiler of a factory located in Akbarabad area exploded with a bang as a result of which roof of the factory caved in on the labourers working underneath.

According to the rescued laborers, over 20 workers were present on the premises at the time of accident.

Police and rescue personnel arrived on the spot immediately and recovered at least four bodies and six injured from under the debris. The dead bodies and the injured have been shifted to Allied Hospital.