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They have 80 kilometres of shelving – enough to stretch from Edinburgh to Glasgow.

AP Sensing says that it can pick up vibrations hundreds of metres away but "usually not several kilometres away".

Claims that sediment would be distributed many kilometres from the mining area were "total nonsense", says Mr Barron.

A massive cloud of dense black smoke was visible for several kilometres.

The war is closer, and more deadly, along the front line, more than 1,000 kilometres long, that runs from the northern border with Russia and then east and south down to the Black Sea.