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On Monday night more than 60 officers attended several blazes in the Mourne Mountains - including the Bloody Bridge fire front near Newcastle stretching one-and-a-half kilometres.

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.