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[google-map-sc]A tanker truck overturned on Highway 520 early this morning, spilling hundreds of gallons of milk and closing the westbound lanes for several hours.

The accident happened just before 1 a.m., as the semi was turning onto westbound 520 from I-405, according to the Washington State Patrol.

The truck driver lost control, WSP said, and the truck tipped over and struck a variable speed limit sign. Between 500 and 1,000 gallons of milk spilled onto the highway.

The incident was cleared by 4 a.m., a WSP communications officer said.

WSP is still investigating the incident and possible charges against the driver, a 42-year-old Redmond man, but says drugs or alcohol did not appear to be involved.