Police are seeking witnesses of a fatal truck rollover in the early hours of Wednesday morning.
The crash was reported about 12.30am near the intersection of Great Eastern Highway and Carter Road.
A white and red coloured Kenworth prime mover with two trailers was travelling east along Great Eastern Highway when it left the carriageway and went down an embankment and struck a large tree, causing the truck and trailers to roll.
The 47-year-old male driver and a 47-year-old male passenger, died at the scene as a result of injuries received in the crash.
Great Eastern Highway remains closed with detours in place through Old Northam Road.
Major Crash investigators would like to speak to anyone who saw the crash, or the Kenworth prime mover travelling in the area prior to the crash.
Anyone with any information is asked to call Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au.
