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Anita Vallejo is comforted by a relative as they wait to retrieve the body of her son Eduardo in Santa Maria,u00a0Philippines, today. Her son was killed in the explosion in a Styrofoam factory.u00a0Pic/AP

Twelve factory workers were killed and five injured when a boiler at a Styrofoam packaging plant exploded in the Philippines.

The explosion occurred late last evening as night shift employees worked at the factory in Santa Maria town in Bulacan province, just north of Manila.