UPDATE: I-5 has reopened in both directions.
SEATTLE -- A major crash in Thurston County snarled the evening commute Monday afternoon on Interstate 5.
According to WSDOT, the crash happened near Maytown, which is about nine miles south of Olympia, around 1 p.m.
WSP says a semi jackknifed along the northbound highway and another tractor-trailer collided into it, forcing the semi through the median and oncoming traffic had to swerve to avoid it.
No one was injured, but WSDOT says it will be several hours before the highway is completely reopened.
As of 6 p.m., all southbound lanes remain closed and the left lane on the northbound side is shut down as crews continue to work.
WSDOT is asking drivers to stay away from the area if they can and provided an alternative route using 93rd Avenue and SR-121.
Use SR 121/Maytown and 93rd Avenue for both directions.
The crash scattered debris across the highway, and crews are working to repair the median before reopening.
The cause of the crash is under investigation.