It was a night that promised to bring 'joy and light' to Sydney's iconic Bondi Beach as crowds of Jewish families gathered at a park to celebrate the first night of Hanukkah, also known as the festival of light.

They were among thousands of other swimmers, surfers, and sunbathers who had flocked to Australia's most famous beach on a scorching summer's afternoon.

But not long after the Hanukkah event kicked off at 17:00 local time and the first free donuts were doled out, festive music was drowned out by the sounds of screams and the echo of gunshots.

It's unclear exactly when the first shot was fired, but the initial call to police was made at 18:47. In the minutes that followed, two gunmen would kill at least 15 people, and injure dozens more, authorities said.

A local high school teacher, Chavi, told the BBC she dropped to the ground to protect her baby as 'bullets were flying above us'.

'It was pandemonium and chaos,' another attendee, who identified himself as Barry, said as he described watching a throng of people trying to escape the scene that had suddenly devolved into a nightmare.

In one video verified by the BBC, upbeat music from the Hanukkah event can still be heard in the background as people crouch down and shots are heard, interspersed with shrieks.

The eerily jubilant music continues playing while the camera pans over the grass, revealing prostrate bodies completely still, their condition unclear.

Separate footage shows groups of people lying atop one another on the grass, as one woman tries to cover a young child's head with her hand.

Panic soon spread from the park to the sand, where videos show terrified beachgoers sprinting away from the gunfire.

Screams, honking car horns, and ambulance sirens fill the air in the next chaotic minutes. Some cars crashed as people desperately tried to get away, witnesses have told the BBC.

A nearly 11-minute video, verified by the BBC, provides perhaps the clearest timeline of the attack.

It begins as the two gunmen make their way across Campbell Parade and onto a pedestrian bridge above the park where the Hanukkah event was taking place.

Using what an expert described as 'two sporting shotguns', the gunmen fired into the crowd.

One gunman, identified as Sajid Akram, was later found dead at the scene, while his son Naveed remains in critical condition after being shot by police.

Eyewitness Ahmed al Ahmed, who also suffered gunshot wounds, has been hailed as a hero for tackling one of the gunmen, potentially saving countless lives.

Police are continuing their investigation, with the focus on the gunmen’s backgrounds and the motives behind this tragic event.