THE Tonkin Highway has reopened after a crash at Thomas Road causes it to be closed this afternoon.
Main Roads tweeted the highway had been blocked at 12.40pm.
The Deparment of Fire and Emergency Services attended because it was believed the crash involved hazardous materials.
A Department spokeswoman said a trailer had overturned in the area, and there was a suggestion it was carrying a liquid fertiliser.
WA Police said the road was reopened at 1.50pm.
— WA Police Traffic (@WAPoliceTraffic) April 26, 2018
Tonkin Hwy CLOSED, SEEK ALT ROUTE northbound at Thomas Rd, Oakford due to crash #perthtraffic
— Main Roads WA (@Perth_Traffic) April 26, 2018