Police say a 36-year-old man who can assist with their inquiries into several incidents in the Rockingham and Kwinana area may be in possession of a firearm.
Rockingham detectives are seeking information regarding the whereabouts of Nicholas John Lawrence.
Mr Lawrence is described as dark skinned, approximately 180cm tall, with a slim build and black hair.
The 36-year-old man could be in possession of a firearm and if sighted, members of the public should not approach him but call Police immediately on 131 444.
Anyone with information regarding the whereabouts of Mr Lawrence is asked to call Crime Stoppers on 1800 333 000 or report it online at www.crimestopperswa.com.au.