Investigations are set to continue into the deadly attack at Sydney's Bondi Beach - including the killers' motives.

A father and son opened fire on some 1,000 beachgoers yesterday, killing 15 people, including a 10-year-old girl. 

Police say it was a terror attack targeted towards a Jewish Hanukkah celebration. 

Australian correspondent Oliver Peterson says officials will also be looking to toughen up gun laws following the attack.

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