Firefighters discovered a 30-year-old woman with critical burn injuries Sunday while extinguishing a mattress fire at a two-story apartment building in Exposition Park.
Firefighters dispatched at 10:24 a.m. Sunday to 3700 S. Western Ave. had the fire out at 10:36 a.m., according to the Los Angeles Fire Department.
The fire was contained to the unit of origin.
Paramedics rushed the woman to a hospital. No other injuries were reported.
Arson investigators were probing the cause of the fire.