The crash created miles-long backups on northbound I-5 during the Tuesday morning commute.

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A motorcyclist died after being thrown from a stolen motorcycle on northbound I-5 shortly after 5 a.m., according to Washington State Patrol spokesman Trooper Chris Webb.

The crash blocked all northbound lanes of I-5 approaching Highway 520, causing miles-long backups during the Tuesday morning commute.

According to Webb, the deceased driver, a woman, was riding alongside another motorcycle, both traveling at speeds greater than 100 miles per hour, when the woman hit the back of a car.

She was thrown from the motorcycle, which then skidded down the road around 400 feet and caught fire, Webb said.

That motorcycle had been reported stolen out of Everett, Webb said.

Webb said in a Tweet that, “Troopers are looking for a second motorcycle/rider that may have been traveling with the motorcyclist that died at the scene.”

He said the second motorcyclist stopped at the scene, tried to put out the fire and then took off northbound again. The second motorcyclist then returned once more and took off again, Webb said.

Traffic was backed up for miles. Webb said he couldn’t say how long the backup was at its peak, but said, “I imagine it’s horrible. The 405 toll roads are going to be getting a lot of business today.”

Seattle Public Schools said 66 buses were late on Tuesday morning because of the I-5  lane closures.