Multiple shark sightings have forced swimmers out of the water at two popular Perth beaches for the third consecutive day.
City Beach and Cottesloe Beach were closed on Monday morning after a three metre and 2.5 metre unknown species of shark and a 1.5 metre hammerhead were spotted by the Surf Life Saving Westpac helicopter.
![Multiple shark sightings have forced swimmers out the water at Cottesloe and City Beach.](/web/20161219164341im_/http://www.watoday.com.au/content/dam/images/g/p/9/8/m/o/image.related.articleLeadwide.620x349.gte4gu.png/1482118604942.jpg)
SLS Westpac Heli report 2.5m unknown sp. shark sighted 09:42hrs 19/12 Cottesloe Beach, Perth Metro, Cont
— Surf Life Saving WA (@SLSWA) December 19, 2016
SLS Westpac Heli report 3m unknown sp. shark sighted 08:52hrs 19/12, City Beach, Perth Metro 80m offshore , moving south.
— Surf Life Saving WA (@SLSWA) December 19, 2016
A member of the public also reported seeing an unknown species of shark chasing fish in the Swan River near Como Beach at 11am.
The beach closures come after Trigg and Scarborough beaches were closed on Sunday, and Floreat and City Beach were closed on Saturday - all due to shark sightings.
Saturday's closures were sparked by a three metre tiger shark spotted close to shore shortly after a local fisherman caught two of the sharks in just two hours and returned them to the water.
A three-metre tiger shark was also spotted 100 metres from shore at Trigg Beach on Sunday, prompting its closure.
On the same day, Premier Colin Barnett launched Perth's first state government-funded $1 million swimming enclosure at Sorrento Beach.
The enclosure ropes off a 500 metre stretch of beach and goes 270 metres out to sea.
"It's designed to make swimming safe... and free of any danger and fear of a shark attack," Mr Barnett said.
"Tragically we've had 13 shark fatalities since 2000."