The crash, south of South 188th Street in SeaTac, blocked four right lanes on northbound I-5, according to the State Patrol.

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A collision on Interstate 5 near Southcenter blocked several lanes and caused a backup stretching at least 7 miles approaching Seattle Wednesday morning, authorities said.

The crash, just south of South 188th Street in SeaTac, involved several vehicles and blocked four right lanes on northbound I-5, according to the Washington State Patrol.

The crash was cleared about 7 a.m., but significant delays remained during rush hour.

Authorities are advising drivers to take alternate routes.