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
Residents notified of military training exercise in Rockingham, Kwinana areas
WAFL: Riddle kicks match-winning goal after the siren to secure victory for Peel Thunder
Secret Harbour MP Paul Papalia to resign from politics
Baldivis Police ask for public's help to find wanted man
Authorities continue to monitor southern right whale in Mandurah Estuary
Australind couple plan retirement, support charities after $1.2 million Lotto win
Rockingham Detectives seek owners of stolen property
Lakelands home damaged by fire
New social housing apartments now complete in Falcon