Mandurah Detectives are calling on the public's help as they continue to investigate an incident in Coodanup.
A woman in her 30s was riding an E-scooter when she was approached by two men, one on an E-scooter and one on a bicycle, as she crossed Mandurah Road onto Wellstead Way about 8.05pm on Monday, November 4.
"One of men was holding what appeared to be a handgun," a WA Police spokesperson said.
"He threatened her, demanding money before she was pushed in the back by the second male. The woman screamed and the men fled."
The offenders were last seen heading through the alleyway before turning onto Tankerton Way.
Detectives urge anyone who may have seen, has vision of, or any information relating to this incident, to contact Crime Stoppers on 1800 333 000 or via www.crimestopperswa.com.au.

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