A 12-year-old girl who was shot in the horrific Bondi Beach attack has tragically died in hospital.

The sad news was announced by Executive Council of Australian Jewry co-chief executive Alex Ryvchin. Mr Ryvchin told CNN a friend had "lost his 12-year-old daughter, who succumbed to her wounds in hospital"."I know everyone who was there," he said. "That’s an event where I attend with my family every single year."

New South Wales Police Police Commissioner Mal Lanyon had said on Sunday night he did not "believe" any children were among the 12 dead but added that a child may be among the 29 injured. "I don’t want to give information that turns out to be incorrect," he said. "It is very early. We know that there has been a number of people turn up to hospital."

Eli Schlanger, a British-born rabbi, was among those killed in the mass shooting, his family confirmed. Police declared the attack a "terrorist incident" and confirmed one of the gunmen was killed and a second suspect is in critical condition.