Police swarmed a Falcon property near Mandurah after a man sustained an alleged stab wound on Thursday.
Its alleged two boys and girl approached a man, in his 60s, outside a house on Cobblers Road about 4:40pm.
Police say the three were in possesion of knives and during an altercation, the man received a deep laceration to his stomach.
The group fled the scene after the man ran behind a gate on his property to escape the situation.
St John ambulance rushed the man to Royal Perth Hospital where he required surgery.
Mandurah Detectives and police cordoned off the crime scene as a manhunt was launched for the possibly armed offenders.
The K9-Unit along, detectives, officers, with the assistance of the Police Air Wing, surrounded Len Howard Conservation Park in Erskine.
It wasn’t long until police were able to track down two boys in the bushland.
The two were arrested and taken into police custody.
A third person, a girl, was arrested in the Mandurah area about 7.45pm.
A 15-year-old boy from Dawesville, 16-year-old girl from Halls Head and a 17-year-old boy from Falcon have each been charged with:
With Intent to do Grievous Bodily Harm Does Grievous Bodily Harm to Another.
All three remained in custody overnight and are due to appear in the Perth Children’s Court today.
Follow Tex Reeks on Twitter via @texreeks.