The build up of small and light weapons in Papua New Guinea's autonomous island of Bougainville has raised some concerns for the national government.

Pacnews reports...PNG Justice Minister Dr Allan Marat raised the issue with his Commonwealth colleagues during a meeting in Edinburgh.

Dr Marat says he discussed the possibility of an arms trade treaty between Commonwealth nations.

He said there was a heavy proliferation of weapons in the PNG highlands, and that arms were smuggled through border regions.

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