An explosion inside an iron factory near a northern Iraqi city killed five workers and injured 15 on Sunday, officials said.
The workers were melting iron inside the factory when a mortar round hidden in the heap went off, according to officials.
Police said it was an accident and not a terrorist act.
The blast took place about 20 kilometers (12 miles) south of Irbil. Irbil, located in the autonomous Kurdish region, is about 350 kilometers (217 miles) from Baghdad.