Polish authorities have warned treasure hunters to stop looking for a rumoured Nazi "gold train" as it could be mined or carrying "dangerous materials".

Such activities had increased in the south-western Walbrzych area after new reports of a train being found.

Earlier this month two men claimed they may have located a train thought to have gone missing in 1945.

It was rumoured to be carrying gold, gems and guns that disappeared in the Second World War.