It was the country’s worst gun attack in about 30 years.

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

Witnesses said the shooting 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 and parks. Police said around 1,000 people had attended the Hanukkah event.

Police said that 40 people remain in hospital following the attack, including two police officers who are in a serious but stable condition.

The victims were aged between 10 and 87, police said.

Authorities said they were confident that there were two offenders involved in Sunday’s incident. Police investigations are ongoing and police numbers have been increased in Jewish communities this morning.

Prime Minister Anthony Albanese called the attack a “dark moment for our nation,” and said police and security agencies were thoroughly checking the motive behind the attack.

“What we saw yesterday was an act of pure evil, an act of antisemitism, an act of terrorism on our shores in an iconic Australian location,” Albanese told reporters.