The terrorist attack targeting Jewish people at Bondi is the worst mass shooting in Australia since the Port Arthur massacre.

Sixteen are dead and many more injured at a place special in Australia's heart, at an event special to the Jewish community, Hanukkah. 

Today, extremism expert Dr Josh Roose on whether authorities failed to heed the warnings. 

Also, Bondi local and Sydney cardiologist Dr James Otton who rushed to assist the wounded.

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Dr James Otton, cardiologist

Josh Roose, associate professor of politics at Deakin University