Adrian Moyse from South Wales Fire & Rescue says that the fire at Glyndwr Industrial Estate in Aberbeeg in Blaenau Gwent may burn for another 24 hours.
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Skies will cloud over with outbreaks of rain and drizzle.
An article in The Sunday Times found Isis used a network of companies operating out of an office in Cardiff to finance terror plots.
Crowds came to hear him speak this afternoon in Bangor - a seat where fewer than 100 votes could make the difference at the next election.