ST. LOUIS — A fire in St. Louis that killed a woman and critically injured a man is being investigated as arson.

St. Louis police Lt. Scott Aubuchon told the St. Louis Post-Dispatch Wednesday that the homicide unit was investigating the fire in south St. Louis.

The fire was reported just before 6 a.m. at a two-story brick duplex. Names of the victims have not been released.

A firefighter suffered minor injuries.