Explosion Reported at Oklahoma Refinery

WYNNEWOOD, Okla. --

An explosion caused a fire at a refinery in Wynnewood, Okla., early Sunday morning.

Authorities from the Garvin County Sheriff's Office said firefighters are at the refinery trying to extinguish the blaze.

There have been several fires at the refinery in the last four years, including the 2007 fire that started when a lightning strike caused an oil tank to explode.

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