Authorities said Brody John McMahon may be able to assist with a current investigation.
Armadale Detectives believe the 18-year-old may be able to assist with ongoing inquiries into several recent incidents in the South East Metropolitan and Central Metropolitan districts.
Mr McMahon may behave in an unpredictable manner and if sighted, members of the public are advised not to approach him but to call police immediately on 131 444.
He is described as having a fair complexion, approximately 175cm tall with a medium build, short cropped blonde hair and blue eyes.
Early voting for Secret Harbour by-election begins Monday
Welfare concerns for missing Swedish national last seen in Warnbro
Wanted man last seen in Golden Bay
Passenger critically injured in West Pinjarra crash
Unregistered painter fined for requesting hefty deposit from Singleton homeowner and not doing the job
Police hunt driver following dangerous Baldivis pursuit
Welfare concerns for boy last seen at Port Kennedy skate park
Rubbish truck catches fire in Baldivis
Driver injured in bus crash in Rockingham