Formerly a colony of Australia, Papua New Guinea is celebrating 50 years of independence. Photo: Mick Tsikas/AAP PHOTOS

Australia will help Papua New Guinea build a new ministerial wing onto its parliament, as a gift to mark 50 years of the nation's independence.

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Prime Minister Anthony Albanese announced the support after attending a state dinner in Port Moresby with other country representatives, including Prince Edward, on Monday.

"Our support for the expansion of Parliament House is an investment in Papua New Guinea's democracy and sovereignty that will benefit future generation

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