LAHORE, Pakistan (AP) — A boiler at a glue-making factory in eastern Pakistan exploded on Friday, killing at least 18 people and injuring 21 others. The force of the blast destroyed the factory building and damaged several nearby homes, igniting a huge fire and spreading panic through the area, officials said.

Police said they arrested the factory manager and were looking for the factory owner who fled shortly after the explosion at the industrial facility in Faisalabad, a city in Punjab province.

The cause of the explosion, was not immediately known, according to Usman Anwar, the Punjab police chief. Police later said a gas leakage may have caused it.

It was not clear how many of the 18 dead were factory workers and how many were local residents. Earlier reports said at least 15 worker

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