Production will cease today at a lamb processing plant on Anglesey with the loss of 310 jobs.
The future of the Welsh Country Foods site at Gaerwen was thrown into doubt in January, after supermarket chain Asda ended its order for lamb.
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Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.
Over 70 firefighters are currently tackling the fire, which is now confirmed to be at a scrap yard.