UPDATE: Fourth worker dies after Wash. refinery explosion - WKOW 27: Madison, WI Breaking News, Weather and Sports

UPDATE: Fourth worker dies after Wash. refinery explosion

ANACORTES, Wash. (WKOW) -- A fourth person has died as a result of an explosion at a refinery in Washington state.

A hospital in Seattle confirmed a 29-year-old victim of the blast died Friday of her burns. She had been in critical condition at Harborview Medical Center, where three other workers remain in critical condition.

The blaze occurred while a unit was being brought back online after maintenance. It took fire crews around 90 minutes to put the fire out at the refinery in Anacortes, which is about 70 miles north of Seattle.

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ANACORTES, Wash. (WKOW) -- Three people were killed in an explosion at an oil refinery in Washington state Friday morning and another four are in critical condition at a Seattle hospital.

The explosion at Tesoro Corp., which happened around 12:30 a.m., shook homes and shot flames high into the night sky.

A hospital spokeswoman says the survivors are in the intensive care unit with major burns over the majority of their bodies.

Fire crews were able to put the blaze out within a few hours.

Anacortes residents told Seattle television stations they heard an explosion and saw flames hundreds of feet into the air over the refinery, which is about 70 miles north of Seattle.

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