UPDATE as of 8:20 p.m. WSDOT said the wreck has been cleared.
The agency tweeted about 7:15 p.m. that the wreck was blocking the road near Borgen Boulevard and Burnham Drive.
Traffic cameras still showed backups there about 8 p.m. WSDOT said the westbound freeway was backed up four miles.
Further details were not immediately available. Check back for updates.