Pakistani officials say a three-story factory has collapsed in the eastern city of Lahore, killing at least three people and trapping dozens of others.

Officials are blaming Monday's collapse on a gas explosion. They say 62 people, including women and children, were inside the factory at the time of the incident. One of the victims may have been as young as 10 years old.

Emergency workers so far have rescued at least 13 people from the rubble and are continuing to search for survivors.

Authorities say the factory, which produced veterinary medical products, had been ordered closed. It was not immediately clear why it was ordered shut or why it was operating despite the closure order.