At least 16 people – including a ten-year-old child – are dead after two men opened fire on a crowd of people celebrating the Jewish holiday of Hanukkah on Sunday in a public park at Sydney’s Bondi Beach. Many more are injured.

I am horrified. But as a researcher who studies hate and extremist violence, I am sadly not surprised.

The Jewish community has been a top target for terrorist ideologies and groups for a long time. Many people working in this field have been expecting a serious attack on Australian soil.

Much remains unclear about the Bondi terrorist attacks and it’s too early to speculate about these gunmen specifically. The investigation is ongoing.

But what about antisemitic sentiment more broadly?

Our research – which is in the early stages and yet to be peer reviewed – has recorded a significant and worrying increase in antisemitic sentiment after October 7.

We have been training AI models to track online sentiment in social media targeting Australian communities, including Jewish people.

That means working with humans – including extremism experts and people in the Jewish community – to label content. This is to teach our model if the content it is encountering is hateful or not.

Based on definitions adopted by the Jewish community, we distinguished between two main types of antisemitism: “old” antisemitism and “new” antisemitism.

“Old” antisemitism targets Jews as Jews. It draws on entrenched myths and stereotypes that portray them as........

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