Police are urging anyone living in the Wellard area to keep an eye out for a missing 21-year-old man.
Jin Hee Chong was last seen near Cockburn Central around 2.40pm on Thursday but police believe he could now be further south in an area bounded by the Kwinana Freeway east to King Road.
Mr Chong is autistic and non-verbal.
He is described as being approximately 165cms tall, with a slim build, and short black hair and was last seen wearing a grey polo short with blue jeans and black and white shoes .
Authorities are urging residents to check their sheds, paddocks or any other areas of shelter that he may have stayed in overnight.
Anyone who sees Mr Chong or knows of his whereabouts should call police immediately on 131 444.

18-year-old male from Lakelands charged over incident in Pinjarra
BREAKING: Reports of a man armed with a firearm in the Pinjarra area
Hayden Ballantyne signs with Rockingham Rams
Mayor reassures community that 'no decision has been made' to close 4WD access at Tim's Thicket, White Hills beaches
DBCA 'sick and tired' of illegal access to Port Kennedy Scientific Park
Mandurah homeless camp goes up in flames
Dawesville community shocked after kangaroo deliberately mowed down
Teens armed with knife, scooter charged over Rockingham Shopping Centre fight
Mandurah private school teacher charged with alleged sexual abuse of male student