A woman has been tortured and burned alive in Papua New Guinea after being accused of using sorcery to kill a young boy, local media report.

The woman, a mother aged 20 named as Kepari Leniata, was stripped, tied up and doused in petrol by the boy's relatives in Mount Hagen in the Western Highlands, said the National newspaper.

She was then thrown onto a fire in front of hundreds of people.

Police and firefighters were unable to intervene, the paper said.

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