The fire service say investigators will be arriving at the scene of this morning's blaze at Blackwood's Pound Stretcher store shortly to begin an investigation into the blaze.
Crews will spend the rest of the day dampening down the building say officers.
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Chad and Brad Daniels hit the salesman with a metal cosh and then knifed him in the stomach.
A fine, warm and sunny day for much of Wales, although a little fresher out towards the west with more in the way of a sea fog.
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