ROUGH CUT - NO REPORTER NARRATION<br/> <br />A three-storey factory collapsed on Monday in the Pakistani city of Lahore after a gas explosion, killing at least three people and trapping dozens, emergency officials said.<br/> <br />An emergency official at the site told Reuters by telephone that two houses next to the factory had also collapsed.<br/> <br />Karamat Ali, a spokesman for the government Rescue 1122 emergency service, said three dead, including a 10-year-old boy, and 13 survivors had been pulled out of the rubble.<br/> <br />He said 17 women and 45 men were at work, when the factory, which produced veterinary medical products, crumbled, and the death toll was expected to rise.<br/> <br />Rescue workers and residents were shifting rubble by hand.
