SYDNEY, Dec 15 (Reuters) - 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.

An event to mark the first day of Hanukkah was taking place at Bondi Beach when the shooting took place, killing at least 15 people ages 10 to 87. Officials declared the shooting a terrorist event and said it was “designed to target” Jewish people.

The deadly shooting during a Hanukkah celebration at Australia's Bondi Beach follows a sharp rise in antisemitic attacks in the country since the Hamas-led assault on Israel on Oct. 7, 2023, and the ensuing war in Gaza.

Chabad-Lubavitch Headquarter's Rabbi Yehuda Krinsky says the Bondi Beach shooting reflects Australia's tolerance of escalating antisemitic violence.

Video appears to show a man tackling and disarming one of the gunmen, as officials say 11 people were killed in an attack "designed to target" Jewish people.

The attack targeting the Jewish community at a Hanukkah event in Australia is "sickening", Sir Keir Starmer has said. At least 11 people were killed in the shooting at Bondi Beach on Sunday and a further 29 taken to hospital, according to police.

New South Wales Premier Chris Minns said the attack "was designed to target Sydney's Jewish community on the first day of Hanukkah."

Police in Australia say two people have been arrested after reports that multiple people were shot at Sydney’s Bondi Beach. A New South Wales state police statement said on Sunday two people had been taken into custody.