Midland Detectives are seeking information about an off-road bike that was stolen in Bullsbrook on Saturday.
About 10.40am, a man in his 40s was riding his blue and white, Yamaha YZF-450 off-road motocross motorcycle in the Gnangara Pine Plantation.
He was flagged down by a group of people on Warbrook Road, Bullsbrook who were standing next to a stationary vehicle with its hazard lights on.
When the victim stopped to see if he could assist, two men in the group threatened him and demanded his motorcycle.
One of the men jumped on the bike and rode off and was last seen travelling in a southerly direction, along with the vehicle.
The motorcycle was sighted around 10.57am, traveling south along Sydney Road in Gnangara.
Detectives would like to speak with anyone who may have seen the Yamaha off-road motorcycle or the group of people in the area around the above times.
Anyone with any information relating to this incident, is asked to call Crime Stoppers on 1800 333 000 or to make a report online at www.crimestopperswa.com.au.