Police have charged two juveniles over four robberies on young males near train stations on the Armadale rail line earlier this month.
A police spokeswoman said the incidents happened in Armadale, Gosnells and Perth on March 1 and 2.
It is alleged the boys, aged 11 and 14, threatened young males and demanded their property during each robbery.
The accused boys were allegedly part of a group who approached their victims near train stations before stealing items such as mobile phones, scooters and back packs from them.
The 11-year-old boy, of Brookdale, has been charged with five counts of aggravated robbery, three counts of stealing and assault.
He is due to appear in the Armadale Children’s Court on March 10.
The teenager, of Armadale, has been charged with two counts of aggravated robbery.
He is due to appear in the Armadale Children’s Court on March 24.