UPDATE: Philadelphia Refinery Fire Has Been Extinguished; Cause Still Not Known

PHILADELPHIA (AP) — Authorities say a fire in a Philadelphia refinery struck by explosions and a pre-dawn blaze last week has now been extinguished as an investigation is launched into what caused it. Fire department and city officials say the blaze at the Philadelphia Energy Solutions Refining Complex was extinguished Saturday afternoon. The fire department’s hazmat unit and the public health department are still monitoring air quality. No threat to public health has been reported