UPDATE, 8:30 a.m.: The crash has been cleared, and traffic has started moving again along Interstate 5.
Initial post: Two lanes of southbound Interstate 5 at state Route 512 are closed following a multi-vehicle collision involving a State Patrol vehicle Wednesday morning.
It could be a few hours before everything is cleared, said the Washington State Department of Transportation at 7 a.m.
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At 7:30 a.m. southbound traffic on I-5 was backing up as far north as South 56th Street.