Two teenagers will appear in court today after they allegedly robbed a 24-year-old at knifepoint in East Perth last night.
The man was walking along Pier Street when he was approached by the boys about 11.30am.
A police spokeswoman said the pair demanded his belonging while threatening him with the knife.
"One of the offenders was armed with a knife, which he held towards the victim's face as he was forced to hand over his wallet and mobile phone," she said.
Officers arrested the 15-year-old and the 18-year-old a short time later.They have been charged with aggravated armed robbery.