A shark has been spotted in the Serpentine River in Furnissdale.
Fisheries officers sighted the shark around 9.50am on Tuesday.
The species is unknown.
River users are advised to take extra caution.

PIC: SharkSmart
Fisheries advise unknown sp. shark sighted 09:50hrs 20/08, Serpentine River, Mandurah , Fisheries have been advised of a shark in the Serpentine river Furnissdale.
— Surf Life Saving WA (@SLSWA) August 20, 2019
Boundary Island Brewery takes out 2025 Peel Business of the Year Award
Demolition begins at old Kwinana Power Station
Drugs, cash, firearm seized in South West ahead of Leavers
Motorcyclist critically injured in Ravenswood crash
Man charged over Port Kennedy bushfire
Fish attractant buoys deployed off WA coast to help boost recreational fishing
Newly redeveloped Stan Twight Reserve Clubrooms unveiled
WATCH: Police hunt arsonist who set cars alight in Port Kennedy
Cold Case detectives ask for public assistance into Halls Head car theft, shots fired incident