A blast Tuesday at a Serbian factory that produces tires, protective gear and industrial explosives killed one person and injured four, police said.

The explosion occurred around 9a.m. at a fuel strip production unit of the Trayal Coorporation factory. 

The factory is located in the central city of Krusevac, according to a police statement.

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It was not immediately clear what caused the blast.

The explosion also resulted in a fire at the complex.

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Police said the injured have been transferred to the Krusevac hospital.