Guinea banned artisanal gold mining in Siguiri on November 2 due to environmental degradation, causing mass exodus.
The trial was condemned as "unethical" and "neocolonial" because half of the babies would not be given the vaccine.
Papua New Guinea police had earlier dismissed speculation that the 32kg object was "merely a dummy".
A police report drawing on analysis using an X-ray machine donated by Australia identifies the shell-shaped object as an undetonated artillery projectile.
England’s Rugby League World Cup campaign is all but over despite victory over Papua New Guinea in their final group stage game
England edge towards a World Cup exit after their points chase against Papua New Guinea descends into a chaotic and error-strewn 34-12 victory that will almost certainly prove insufficient.
As many as eight million people have been affected by the cascading issues of food shortages, electricity loss and health clinic closures
The deadly shootout with police follows days of gun violence in Kimbe, the capital of West New Britain province.
Health & Wellness
The decried trial was canceled last week before police seized vaccine doses.
Health & Wellness
Guinea-Bissau police said hepatitis B vaccine doses were taken as part of an investigation.
Technology
MPs in PNG to decide on ratifying a 2019 referendum in which Bougainvilleans voted overwhelmingly in favour of independence