ISLAMABAD: Prime Minister Muhammad Nawaz Sharif Wednesday expressed grief over casualties in a factory building collapse at Sundar Industrial Area, Lahore.

The prime minister also directed the Punjab Government to expedite rescue efforts. The statement came shortly after 11 workers were killed and scores were trapped when a factory at Sundar Industrial Estate collapsed in Lahore.

Rescue operation was under way to save the trapped survivors. According to medics, 70 people have been brought to hospital and out of those 15 are in critical condition.