Police say they have located a man they were seeking in a search for a suspected gunman at Pinjarra, about 80 kilometres south of Perth.
Mandurah District Acting Superintendent Darren Hart said the search had been sparked after multiple calls this morning about a man seen with a longarm in the Pinjarra area.
The man was seen acting suspiciously at a home on Pollard Street about 9.30am.
READ MORE: Acclaimed Australian author faces court on alleged child exploitation offences
About 40 minutes later, a man was seen CCTV in a yard holding what appeared to be a firearm.
"Police are investigating a report that a projectile may have been discharged at that residence," Hart said.
There was no one home at the time and no injuries have been reported, he said.
Just before 5pm (8pm AEDT), WA Police said they had found an 18-year-old man who was assisting with inquiries.
"There is no ongoing threat to public safety," police said.
Significant resources had been deployed to the area.
Several homes in Pinjarra and Mandurah were searched and multiple people were assisting police with their investigations, Hart said earlier.
"If the man is sighted, members of the public should remain inside, hidden from sight and immediately contact triple zero," Hart said at a press conference earlier today.
Last week police launched a search for 58-year-old Kenneth John Giles after a woman was shot at a rural property near Mullewa, about 400 kilometres north-west of Perth.
Police said today's incident and the search for Giles did not appear to be linked.
DOWNLOAD THE 9NEWS APP: Stay across all the latest in breaking news, sport, politics and the weather via our news app and get notifications sent straight to your smartphone. Available on the Apple App Store and Google Play.