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WILLINGBORO, N.J. (AP) _ An explosion tore through a scrap metals factory Friday in an industrial area outside Philadelphia, killing one worker and injuring more than a dozen others.

John Carroll, Willingboro emergency management coordinator, confirmed the death at Hi-Temp Specialty Metals Inc. but did not release the victim's name. Fourteen other people, some from a neighboring building who complained of smoke inhalation, were treated at hospitals.

Fifteen to 25 people had been inside the factory when the blast tore through the roof of the building about 9:30 a.m.

The explosion happened in an acid bath and caused an ``acid plume,'' said Rachel Hamilton, a spokeswoman for the state Department of Environmental Protection.

Carroll said air monitoring equipment set up outside the factory had not detected any air quality problems. All the workers had been accounted for, he said.

Carol Macaluso, who works nearby, said her building shook with the explosion at the factory, in an industrial area about 10 miles northeast of downtown Philadelphia. ``We ran outside and saw flames shooting up from the building,'' she said.

Twelve people were treated at Rancocas Hospital, many of them with burns on their hands and faces, spokeswoman Wendy Marano said. At least two others were taken to a medical trauma center in Camden.