A witness to the horrific Bondi Beach massacre has spoken out about the moment he ran towards the alleged gunman and stomped on his head.

Jacob Barnfield had just gone for a swim at Australia's most famous beach on Sunday afternoon when he heard a series of gunshots go off.

Those gunshots, allegedly fired by Naveed Akram, 24, and his father, Sajid Akram, 50, left 15 innocent people dead and more than 40 others hospitalised.

The terrifying shooting unfolded as hundreds gathered to attend the Jewish Chanukah by the Sea event, marking the first day of Hanukkah. 

Mr Barnfield said at first he thought the loud banging sounds were fireworks but quickly assumed the worst when he heard screaming and saw people running for their lives.

Bravely, Mr Barnfield chose to run towards the shooters who were standing on a pedestrian footbridge, weaving in and out of terrified bystanders, until he was close enough to see Naveed. 

'I was trying to get closer to him, just to try and disarm him. But the closer you got to the shooters, the more bodies you saw on the floor. Just body parts on the floor, next to the bodies,' he told Sunrise's Nat Barr on Monday.

He said that police had managed to shoot the father and son and had restrained them on the ground of one of the pedestrian bridges when bystanders rushed over.

'People were just stomping on his (Naveed's) head. I got a pretty good shot on his head as well, but I feel like it was pretty well deserved considering the circumstances,' he said.

'I had so much anger built up just to kick them because you've just seen all the dead bodies, you've seen the families screaming and crying. There was children on the floor screaming and crying.'

Barr said Mr Barnfield had done something 'every Australian wanted to do'.

'Yeah. It was a bit of a dog shot, but I don't regret it at all. He deserved every bit,' he said.

Mr Barnfield described the scene as carnage and said bystanders were trying to jump on top of the alleged shooter. 

'You don't think about how dangerous it is when you're running past kids bleeding out, families covering their children, and people with organs exposed. It's just fight or flight,' he told the Daily Mail.

'It's something you don't usually see in Australia. You'd expect it in America, but here - it's pretty crazy.'

Horrifying footage captured the two shooters standing on the footbridge, allegedly firing round after round as thousands desperately tried to flee the beach.

As police worked to revive the alleged gunmen, several bystanders ran towards them and were seen stomping on their heads, before they were pushed away by officers.

Sajid was killed in the shooting while his son remains in hospital under police guard. 

Six of the 15 innocent victims have been identified, including a ten-year-old girl, a Holocaust survivor, and a 27-year-old French Jewish citizen.

NSW Police Commissioner Mal Lanyon said there was no third attacker, after initial unconfirmed reporters suggested there could be another shooter.

The father, Sajid, is a licensed firearms holder who owned six firearms, which were all recovered at the scene in Bondi.

'He had six firearms licensed to him,' Commissioner Lanyon said.

'We are satisfied that we have six firearms from the scene yesterday, but also as a result of the search warrant at the Campsie address.

'Ballistics and forensic investigation will determine those six firearms are the six that were licenced to that man, but also they were used in the offence yesterday at Bondi.'

Commissioner Lanyon would not comment on a potential motive or whether a possible manifesto was left behind by the alleged gunmen.

'We're still very early in the investigation,' he said.