A mass shooting in which 15 people were killed during a Hanukkah celebration at Sydney's Bondi Beach was "a terrorist attack inspired by Islamic State," Australia's federal police commissioner Krissy Barrett said Tuesday.

Axar.az informs, citing CBC, the suspects were a father and son, aged 50 and 24, authorities have said. The older man was shot dead while his son was being treated at a hospital on Tuesday.

A news conference by political and law enforcement leaders on Tuesday was the first time officials confirmed their beliefs about the suspects' ideologies.

Australian Prime Minister Anthony Albanese said the remarks were based on evidence obtained, including "the presence of Islamic State flags in the vehicle that has been seized."

There are 25 people still being treated in hospitals after Sunday's massacre, 10 of them in critical condition. Three of them are patients in a children's hospital.

Also among them is a man who was captured on video appearing to tackle and disarm one assailant, before pointing the man's weapon at him and then setting the gun on the ground.

Those killed ranged in age from 10 to 87 years old. They were attending a Hanukkah event at Australia's most famous beach Sunday when the gunshots rang out.