Two alleged gunmen who killed 15 people at a Jewish celebration at Sydney’s Bondi Beach were a father and son, police said on Monday, as Australia began mourning victims of its worst gun violence in almost 30 years.

The father, a 50-year-old, was killed at the scene, taking the number of dead to 16, while his 24-year-old son was in a critical condition in hospital, police said at a press conference on Monday.

The father and son were identified by state broadcaster ABC and other local media outlets as Sajid Akram and Naveed Akram, respectively.

Officials have described Sunday’s shooting as a targeted antisemitic attack.

Forty people remain in hospital following the attack, including two police officers who are in a serious but stable condition, police said.

The victims were aged between 10 and 87.

Witnesses said the attack at the famed beach, which was packed on a hot evening, lasted about 10 minutes, sending hundreds of people scattering along the sand and into nearby streets.

Police said around 1,000 people had attended the targeted Hanukkah event, which was held in a small park off the beach.

A bystander captured on video  tackling and disarming an armed man during the attack has been hailed as a hero whose actions saved lives.

7News Australia named him as Ahmed al Ahmed, citing a relative, who said the 43-year-old fruit shop owner had been shot twice and had undergone surgery.

A fundraising page for the man had raised more than A350,000 dollars ($233,000) by Monday afternoon. Police did not release the shooters’ names, but said the father had held a firearms licence since 2015 and had six licensed weapons.

Home minister Tony Burke said the father arrived in Australia in 1998 on a student visa, while his son is an Australian-born citizen.

Police did not provide details about the firearms, but videos from the scene showed the men firing what appeared to be a bolt-action rifle and a shotgun.

(Reuters/NAN)