11 killed, 2 injured after cylinder blast at Lahore perfume factory.

Lahore -- At least 11 people were killed and two others were injured on Tuesday after gas cylinders exploded at a perfume factory in Shahdara area of Lahore, setting the entire building ablaze, confirmed the officials.

One of the injured, identified as 30-year-old Zahid, was shifted to Mayo hospital in critical condition.

The fire also caused the roof of the building to collapse, trapping other residents of the building beneath the debris as well as damaging the structure located adjacent to it.

Residents of the area said the factory was considered to be a textile manufacturing unit. "We only got to know about the presence of perfume and other chemicals after the fire broke out," one of the residents said.

A rescue operation was under way to rescue the remaining...