City of Mandurah rangers have closed Avalon Beach in Falcon due to a number of shark sightings.
Three bull sharks were spotted about 500 metres off the Yeedong Road boat ramp around 8.40am on Wednesday.
The Surf Life Saving helicopter has also sighted two sharks off Peron in Rockingham.
The two-metre sharks were swimming about 300 metres offshore around 10am.
Point Peron Beach has also been closed.
Beachgoers are reminded to be extra vigilant in the water.
Daniel Bandy appointed CEO of Peel Thunder Football Club
Dwellingup comes alive ahead of Dwellingup 100 and Mighty Jarrah Trail Run event
Man charged, others on the run after Mandurah Forum knife incident
Man critically injured in North Dandalup crash
Kwinana Recquatic's swim school recognised nationally
Rockingham Police: Locals advised not to approach wanted man
Concerns for missing girl
Peel Thunder cruise into 2026 WAFL grand final
Two teens cautioned, one charged over brutal Falcon attack