Australia Weather News

A young surfer has escaped uninjured after a shark bit off a chunk of his surfboard on Sydney's northern beachesin the city's second shark-related incident in 24 hours.

Surf Life Saving NSW confirmed the boy was unharmed after an encounter with a shark at Dee Why Beach just before lunchtime on Monday.

NSW Police were told by witnesses at the scene that the boy involved is an 11-year-old.

Resources from police marine area command have been deployed to the beach.

NSW Ambulance said it was not called to the scene.

A drone has been launched to try and locate the shark involved.

Dee Why Beach has been closed for the last few days due to rough surf conditions.

It is the second attack in as many days after a 12-year-old boy was critically injured at Shark Beach at Vaucluse on Sunday.

He remains in intensive care at Sydney Children's Hospital in Randwick.

Marine Area Command commander Superintendent Joseph McNulty said earlier on Monday heavy rainfall may have contributed to the attack at Vaucluse.

"At the time yesterday, the boys were jumping off a 6-metre rock that's popular in the Vaucluse area into that brackish water," he said.

"We believe the combination of the brackish water, the fresh water, the actions of the splashing, may have made that perfect storm environment for that shark attack yesterday."