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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UKIP Assembly Member Michelle Brown has apologised after a recording emerged of her using a racial slur.
There will be a number of road closures in place in Cardiff today as the British Speedway Grand Prix returns to the Welsh Capital.
Today will be a day of often heavy showers, with the risk of hail and thunder.