The swimmer suffered “catastrophic injuries” in the attack near Buchan Point
The swimmer suffered “catastrophic injuries” in the attack near Buchan Point.
Witnesses told local television they had seen the attack on a swimmer wearing a wetsuit.
"Some guy was swimming and a shark came and attacked him vertically," witness Kris Linto, told Nine.
"We heard a yell and turned around it looked like a car had landed in the water, a big splash then the shark was chomping at the body and there was blood everywhere."
Another witness estimated the shark was 4.5 metres in size.
"When he went down there were so many splashes," the witness, who had been fishing on rocks nearby told ABC.
The New South Wales state government has spent millions of dollars on technology in an attempt to reduce shark attacks along its coast amid public concern, deploying nets at 51 beaches, as well as drones and shark listening stations that can track white sharks by satellite and send an alert when one is sighted.
It was the first fatal shark attack in Sydney since 1963, data shows.
Emergency services were called at around 4:35pm to Buchan Point, Malabar, in Sydney's east, NSW police said. It said the Little Bay Beach has been closed.
"Officers attached to Eastern Beaches Police Area Command, with assistance from the Marine Area Command and Surf Life Saving NSW, attended and located human remains in the water," it said.
The police offered no information about the identity of the swimmer.
A NSW Ambulance spokeswoman said paramedics were called to Little Bay, "unfortunately this patient had suffered catastrophic injuries and there was nothing paramedics could do."