Students in Cardiff are being used to smuggle cigarettes into the country.
It is thought they are giving their addresses so that smugglers can deliver illegal so-called 'cheap whites' into the UK.
The cigarettes come from China and in the last two weeks more than 40 parcels of them have been seized in Cardiff alone.
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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.