At least 16 people are dead and 38 others injured in a terrorist attack at Bondi Beach in Sydney.

Hundreds of people had gathered at Bondi for an event to celebrate the first day of Hanukkah, when gunmen opened fire.

Massey University Centre for Defence and Security Studies Senior Fellow John Battersby told Kerre Woodham that police responded as quick as they could, but it can be difficult to predict these attacks. 

"Law enforcement agencies and intelligence agencies are pretty good at what they do, but they do not have a crystal ball."

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