Police have released CCTV footage of a man wanted over the alleged assault of a security guard at Lakelands Shopping Centre.
The man was in Coles when he threatened the store manager and guard with a knife around 4pm on Sunday.
He then slashed the security guard on the shoulder before fleeing the store on foot.
The man is described as 20 to 30 years of age, with fair skin and a slim build, black hair, facial hair and a spider tattoo on his right cheek.
Detectives are urging anyone who saw the incident, or can identify the man pictured, to call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.
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