LAKE TOWNSHIP, Mich. (AP) — A small fire led to the shutdown of one of the two units at a nuclear power plant in southwestern Michigan, utility officials said Sunday.

The fire happened Saturday night in a non-nuclear section of the Donald C. Cook Nuclear Plant and there was no release of radioactive material or other danger.

The cause of the fire wasn't yet known.

American Electric Power Co. spokesman Bill Schalk said the fire started in a turbine generator that uses steam to generate electricity.