Bondi Beach Shooters Motivated by Islamic State, Australia Says

The 50-year-old shooter was killed at the scene on Sunday, while his son remained in a coma after being taken to a hospital under police custody

ADELAIDE, Australia—The shooters who attacked a Hanukkah event at Sydney’s Bondi Beach on Sunday appear to have been inspired by Islamic State, Australia’s prime minister said Tuesday, as investigators looked into the events that led to the country’s worst mass shooting in nearly 30 years.

Mourners gather around floral tributes at Bondi Pavilion to honor the victims of the Bondi Beach shooting.

Police said they found two homemade Islamic State flags alongside improvised explosive devices in a car registered to a 24-year-old man accused with his 50-year-old father of carrying out the attack, in which 15 people were killed and dozens injured.

“It would appear that this was motivated by Islamic State ideology,” Prime Minister Anthony Albanese said Tuesday. “The ideology that has been around for more than a decade that led to this ideology of hate and, in this case, a preparedness to engage in mass murder.”

Authorities are also examining why the pair traveled to the Philippines last month, police said, adding that the purpose of that trip and where the father and son visited have yet to be determined.

The 50-year-old shooter was killed at the scene on Sunday, while his son remained in a coma after being taken to a hospital under police custody.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com