The alleged father and son gunmen who killed at least 15 people in a mass shooting at Australia's Bondi Beach may have been inspired by the ISIS terrorist organization.

The father and son accused of carrying out Sunday's antisemitic attack at Bondi Beach appear to have been inspired by the Islamic State extremist group, Australian Prime Minister Anthony Albanese said Tuesday,

Fifteen people - including a 10-year-old girl and a British-born rabbi - were killed when two gunmen targeted Jewish people attending a Hanukkah event.

Investigators are probing a trip the father and son alleged to have carried out the attack took to the Philippines. The Sydney Opera House was lit up with a menorah overnight in a message of support and solidarity to the Australian Jewish community.

The death toll of the horrific Bondi terror attack has risen to at least 16 people, including a 10-year-old schoolgirl, with fears the number of victims will continue to grow. Sky News Australia has rolling coverage of the tragedy.

While a Sydney shopowner is being hailed ‌as ​a hero after disarming one of the ‌gunmen shooting at a Jewish holiday event at Sydney’s Bondi Beach, a couple and ​another man who died after physically confronting the attackers are also being remembered for their heroic efforts to save those around ‍them.

The father-son duo behind Sunday's Bondi Beach shooting were motivated by "Islamic State ideology," Prime Minister Anthony Albanese said.