As part of the historic defense pact, Australia is anticipated to purchase up to five nuclear-powered submarines of the US Virginia class in the 2030s.

The Queensland capital was awarded the 2032 summer Olympics and Paralympics two years ago, returning the Games to Australia for a third time after Melbourne 1956 and then Sydney 2000.

The Reserve Bank of Australia (RBA) said it would consult Indigenous people on a new design that "honours the culture and history of the First Australians".

Two helicopters collided in mid-air, killing four people Monday at Australia's Gold Coast tourism hotspot, officials said, with images showing one of the aircraft's rotors lying on a sandbar.