Mandurah detectives are on the hunt for a man who exposed himself to a teenager, while she was running in Lakelands on Friday morning.
The girl was running along Lake Valley Road at 6.20am, when she noticed a white van drive past her and park on Keelia Vale.
As she ran by the van, a man in his 30s called out to her and exposing himself.
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The girl kept on running and the man drove off in the van.
The van is described as white, with its rear window painted over.
The man is described as fair skinned, with a slim muscular build, green eyes and dark blonde hair.
Detectives would like to speak to anyone who was in the area at the time and saw the man or the van.
Anyone with information is asked to phone Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.