A 12-year-old boy was killed and dozens of people, including women and children, were trapped on Monday when a factory collapsed in Pakistan's second-largest city of Lahore, police said.
Witnesses said up to 150 people normally worked at the three-storey building in the eastern city's congested Multan Road neighbourhood.
Police said 40 people had been inside at the time of the accident, and that the building was brought down when a boiler exploded.
An AFP photographer saw women and children being taken out with injuries and covered in dust.
"There are one dead, nine injured," police official Shoaib Khurram Janbaz says 30 to 35 people were still trapped under the rubble.
He identified the dead person as a 12-year-old boy and said five women were among nine people injured.
"It took place because of an explosion in the boiler. There has been damage to nearby buildings as well," Janbaz added.
Witnesses said the factory had manufactured veterinary injections.
Eight million people live in Lahore, 253 kilometres (160 miles) southeast of the capital Islamabad. It is considered Pakistan's cultural capital and perhaps the most liberal city in the conservative Muslim country.