Two teenage girls have been set upon by a group of young female offenders in separate incidents in Mandurah and Halls Head.
The trio allegedly targeted a 14-year-old girl near the Mandurah Foreshore around 3.45pm on Sunday, November 17.
The incident continued in the Smart Street Mall between Mandurah Terrace and Tuckey Street before the victim sought help from a nearby family who were sitting inside a pub.
"The second incident occurred about 4pm, and occurred on the Estuary Bridge on the Halls Head side and continued to the skate park," a WA Police spokesperson said.
"Members of the public assisted a 16-year-old girl who was being harassed and assaulted."
Three juvenile girls have been charged with aggravated armed robbery and attempted armed robbery and are due to appear in court next month.
Detectives wish to speak to anyone who saw either of the above incidents, involving three female juvenile offenders, particularly anyone who assisted the victims.
Anyone with any information, or vision relating to these incidents is urged to contact Crime Stoppers on 1800 333 000 or via www.crimestopperswa.com.au.
Mandurah woman completes grueling English Channel swim
Man and child seriously injured in South West crash
Motorists warned to expect delays during Kwinana Freeway upgrades
Driver injured in Serpentine crash
Man and woman wanted for questioning over Lakelands car theft
Mission Australia celebrates 25 years of supporting young people through Mandurah Reconnect program
'Mad Eagles fan' wins $6 million Lotto prize
Mandurah woman loses everything in house fire
Gift card scams surge past $1 million prompting urgent warning from Consumer Protection