I-5 northbound lanes blocked near Federal Way after serious accident

A serious accident blocked all lanes on northbound I-5 near Federal Way Sunday morning, according to the Washington State Patrol.

The accident was caused by a vehicle coming from the southbound I-5 lanes into the northbound lanes, with serious injuries reported, Trooper Rick Johnson tweeted at 8:17 a.m.

All northbound lanes were blocked for a time at the site, near the SR-18 and I-5 interchange, Johnson wrote.

By 9:15 a.m., two lanes were reopened, but the state Department of Transportation urged drivers to seek alternate routes in a tweet warning of “big delays.”

The accident followed another I-5 pileup in King County on Sunday morning that temporarily blocked southbound traffic near Auburn.

That 15-car collision closed four lanes after 6 a.m. at southbound I-5 near South 272nd Street, according to WSDOT. The lanes were reopened after 8 a.m.