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A surfer is in a critical condition after a third shark attack at a Sydney beach in just over 24 hours.
Emergency services were told the man had been bitten on his leg at Manly Beach about 6.30pm today.
A group pulled the man from the water and onto the sand.
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A NSW Ambulance spokesperson said the victim was in a critical condition.
Multiple emergency services, including paramedics, the intensive care ambulance, a helicopter and police, are on scene responding to the incident.
It comes after a suspected bull shark bit an 11-year-old boy's surfboard on Sydney's Northern Beaches this morning and another child was mauled at a beach in the city's east yesterday.
Authorities said a shark took an estimated 15-centimetre chunk out of the boy's surfboard at the netted Dee Why Beach, near Dee Why Point, about 11.45am today.
The boy, who was helped by lifesavers, managed to walk away from the close encounter unscathed.
The NSW Department of Primary Industries and Regional Development said photo analysis of the bite mark suggested it was likely from a bull shark.
Department crews, lifesavers and the local council were responding to the incident.
Jet skis were patrolling the waters as a drone monitored the area from above.
Dee Why Beach has been closed for at least 24 hours.
All other ocean beaches on the Northern Beaches, except for Palm Beach, remained closed today due to dangerous surf conditions.
Swimmers are advised to be careful, avoid the beaches, and stay clear of low-visibility and murky water.
The incident comes just a day after another suspected bull shark mauled a 12-year-old boy about 27 kilometres away near Shark Beach in Vaucluse.
He suffered serious injuries to both legs and was pulled from the water by his friends and emergency services.
He is fighting for his life at Sydney Children's Hospital.
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