At least 16 people were killed and 40 injured when a factory collapsed in the eastern Pakistani city of Lahore, the local administration chief told AFP, with around a hundred more still trapped.

"The rescue workers have so far retrieved 16 dead bodies while at least 40 injured have been taken to hospitals," Mohammad Usman said.

Jam Sajjad Hussain, a spokesman for the rescue services, said 100 people were still trapped, while ambulances were taking the injured to hospital.