Police are continuing their investigation into an aggravated armed robbery in Cooloongup on Monday.
Around 5:30pm, it's believed a 15-year-old boy was waiting at the bus stop on Council Avenue, Rockingham when it is alleged a group of males started verbally threatening him.
They all proceeded to get on the 562 bus and when the victim got off at the stop on Wilmott Drive, near Grange Drive, the offenders followed him off the bus.
It is alleged one of the youths grabbed the victim and pushed him whilst the other two threatened him with knives and told him to take his shoes off.
The offenders fled with several personal items of the victim.
A 15-year-old boy from Coodanup has been charged with Aggravated Armed Robbery and is due to appear in the Perth Children’s Court today.
The investigation is ongoing.

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