A large shark has been spotted swimming close to a popular beach in the Australian city of Perth. Beachgoers were forced to cut short their dips at Mullaloo Beach after the 2.5 metre-long (8ft) tiger shark was seen around midday The beach was particularly busy when the predator approached, as it is currently the long summer school holiday in Australia. This was the second time the beach had to be shut in less than a week after a previous sighting of a shark along the shoreline on 5 January. Aerial footage showed the shark prowling the shoreline, just metres away from oblivious swimmers enjoying the water. The video shows a woman wading in the shallow waters very close to the shark and a child with a bodyboard running out of the water. The video was filmed by Perth resident Toby Nicol, who said: "We nicknamed it Trevor. The shark has been using the shallows of Perth's northern beaches for a month now and has had many close encounters with people." Tiger sharks have been known to attack and even kill humans – they are second only to great whites in the number humans they are known to have attacked.