The police found two homemade Islamic State flags in the car of the suspects, a 50-year-old man and his 24-year-old son.

For Australia’s tiny Jewish population, Bondi Beach was a refuge within a vast country that offered sanctuary to families fleeing a seething hate that killed six million of their kind within the lifetime of some of their oldest members.

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The authorities are vowing to crack down after a mass shooting at a Jewish holiday celebration. Experts say that what the country needs might not be new laws.