UPDATE: Surf Life Saving WA has been kept busy with several shark sightings along the coast today.
Rangers closed Floreat Beach this afternoon after a rescue helicopter spotted a 3m-long shark "300m north of Floreat drain, 150m offshore and tracking west".
A 3m-long tiger shark was spotted swimming 150m from the shore at Brighton Beach this afternoon.
Brighton and Scarborough beaches were closed, although Scarborough has since been re-opened.
SLSWA has tweeted: "The Westpac Rescue Helicopter has resighted the 3m tiger shark. It is now 300m offshore @ Peasholm Street dog beach, tracking north (sic).
"The area from Brighton to Peasholm Street dog beach is closed."
Surf Life Saving WA tweeted two hours ago that the South West Helicopter had also seen a 3.5m shark 100m offshore at Castle Rock Road.
A 3m-long shark was also spotted 50m offshore, north-west of Eagle Bay, this morning.
It is not known what species of shark was spotted.