Police divers are currently searching for a man who was last seen at a popular swimming spot near Collie.
The man in his 20s went swimming in Stockton Lake around 3.15pm on Sunday.
Police say the man required assistance but members of the public who were on the shore were unable to help him.
The search is continuing today, while the lake has been closed off to the public.
Stockton Lake is a popular camping spot and was once a mine site before it was filled with water to form an artificial lake.
Peel Thunder cruise into 2026 WAFL grand final
Two teens cautioned, one charged over brutal Falcon attack
Nearly 100 new rentals to be built in Mandurah
Blue swimmer crabs off limits during season closure
Fire crews on scene of Meadow Springs house fire
Perth's southern suburbs declared One Nation's 'heartland' after Secret Harbour by-election victory
Construction contract awarded for Kwinana Freeway upgrade
Port Kennedy humpback whale buried at landfill facility
Secret Harbour by-election: Where to vote on August 29