132 jobs could be lost after aluminium giant Sapa announced a consultation that could see the closure of its plant in Bedwas, near Caerphilly.
The company said it needs to remain competitive in the face of "significant changes" to its markets in recent years.
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In July, the UK Government announced that the sale of new diesel and petrol cars and vans will be banned in the UK from 2040.
St Asaph suffered extensive flooding in 2012. The bridge is being replaced with a new one, which is higher and wider.