Efforts to contain a huge diesel spill in Russia's Far North have failed to prevent fuel from seeping into a nearby Arctic lake.

The incident, which experts say will take water systems 'decades to recover from', happened in the Siberian industrial city of Norilsk, 1,800 miles (2,900km) northeast of Moscow.

Vladimir Chuprov, from Greenpeace Russia, says there are high chances the fuel will spread.

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