GUJRANWALA: At least five people were killed as the roof of a flour mill collapsed following a boiler explosion in Punjab's Gujranwala district on Saturday.

At least 70 labourers were working in the factory when the boiler exploded causing the roof to collapse. Sources told DawnNews that the roof collapse left five dead and at least 30 injured.

Out of those wounded, 10 critically injured workers were shifted to Lahore while the rest were provided first-aid on the site.

Around 10 to 15 labourers are still trapped under the rubble, rescue sources said.

Chief Minister Punjab Shahbaz Sharif took notice of the incident and demanded an inquiry report while expressing grief over the loss of life and property.

Police took the mill's owner and its manager into custody and initiated a probe into the incident.