Fire at Playworld plant ruled accidental A state police fire marshal says the flames started in a curing oven in the back of the building. Author: WNEP Web Staff Updated: 9:03 PM EDT May 6, 2021 LEWISBURG, Pa. — A company in Union County has millions of dollars in damage to clean up after a fire this week. Flames sparked around lunchtime on Tuesday at the Playworld Systems plant. All 120 employees made it out OK. A state police fire marshal says the flames started in a curing oven in the back of the building. The cause of the fire has been ruled an accident.