SYDNEY — Two gunmen attacked a Hanukkah celebration on Sydney’s Bondi Beach on Sunday, killing at least 11 people in what Australian Prime Minister Anthony Albanese called an act of antisemitic terrorism that struck at the heart of the nation.

The massacre at one of Australia’s most popular beaches followed a wave of antisemitic attacks that have roiled the country over the past year, although the authorities didn’t suggest those and Sunday’s shooting were connected. It is the deadliest shooting in almost three decades in a country with strict gun control laws.

One gunman was fatally shot by police and the second was arrested and in critical condition, authorities said. Police said one gunman was known to security services, but there was no specific threat.

At least 29 people were

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