A man killed by a shark in Australia has been named, as a witness described hearing screams of "don't bite me" moments before the fatal attack.

Emergency services responded to reports that a man in his 50s had suffered critical injuries at Long Reef Beach, Sydney, shortly after 10am (1am in the UK) on Saturday.

Authorities said that the man was brought to shore but died at the scene.

The victim - named by Australian media as Mercury Psillakis - was married and had a young daughter, police said - with the incident happening a day before Father's Day in Australia.

Two sections of a surfboard have been recovered and taken for examination, and beaches near the area are closed as drones search for the animal.

Police are liaising with wildlife experts to determine the species of shark inv

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