Semi rollover crash blocks southbound I-5 in Kent

(WSDOT)

A semi-truck rollover crash on I-5 in Kent caused a miles-long backup on Friday. 

The crash happened in the southbound lanes near State Route 516 before noon.

Officials with the Washington State Department of Transportation said the crash had blocked two HOV lanes. 

Drivers were advised to take alternate routes and be prepared for any delays. 

Lanes slowly reopened early Friday afternoon.

As of 12:15 p.m., the backup was about 3 miles long. 

It's not known what led up to the crash. 

Trooper Rick Johnson said no injuries were reported. 

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This is a developing story, and will be updated.