Investigators allege a father and son accused of killing 15 people at a Hanukkah celebration in Bondi Beach threw four homemade explosive devices at the crowd before opening fire.

Court documents say the suspects trained in advance, recorded a video citing extremist motivations, and were inspired by the Islamic State group.

Police are examining whether they received outside support, including during a recent trip to the southern Philippines, a region linked to extremist activity.

The attack has sparked grief and anger within Australia’s Jewish community, prompting Prime Minister Anthony Albanese to apologize amid criticism over ignored warnings of rising antisemitism, NBC News has reported.

The father was killed at the scene, while the son survived and now faces dozens of charges, including terrorism and 15 counts of murder.