The Washington State Department of Transportation says, "Avoid. Avoid. Avoid." Only one lane is open on northbound Interstate 5.

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A 12-mile traffic backup has formed after a crash on northbound Interstate 5 just south of Martin Luther King Jr. Way in Tukwila.

Four lanes of traffic were blocked by the wreck. About half an hour later, the lanes were reopened, but delays remained. One person was injured in the crash.

“The backup is stretching … into Des Moines,” said Nicole Daniels of the Washington State Department of Transportation. “We’re encouraging drivers to use alternate routes to get around this.”