Twelve people were killed and more than two dozen injured in a shooting by two gunmen at a Jewish holiday event at Sydney's Bondi Beach on Sunday.

Australian police have deemed the shooting a terrorist attack and are working to determine whether others were involved.

One suspected gunman was dead and another in critical condition, authorities said. A police officer is also among the dead and another was injured, New South Wales Police Commissioner Mal Lanyon confirmed at a news conference with New South Wales Premier Chris Minns.

"No stone will be left unturned," Lanyon said. "This news of violence, the taking of innocent lives, is unacceptable to New South Wales."

Hundreds had gathered for an event at Bondi Beach called Chanukah by the Sea, which was celebrating the start of the Hanuk

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