Around 20 firefighters have been battling a blaze at the Royal Welsh Showground at Llanelwedd near Builth Wells.
Mid and West Wales Fire and Rescue Service said it broke out in a large amount of hay and straw on a lorry and trailer, shortly before 1am.
Appliances from Builth Wells, Llandrindod Wells, Llanwrtyd Wells and Rhyader are still at the scene damping down. There are no reports of injuries.
Meanwhile firefighters are still at the scene of a fire which broke out in the roof space of a house in Cedar way in Colwyn Bay.
There are more than 3,000 competing in this year's Royal Welsh Show and amongst them are four Gelderlander led by the UK's youngest coachman.
Daniel Williams, 39, from Llanwrda in Carmarthenshire, has the task of parading the show's Lady Ambassador around the main ring. Hannah Thomas caught up with him at the showground.
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There are designated parking areas signposted on the outskirts of the showground.
There is a shuttle bus operating between the car parks and the showground.
Visitors can expect traffic congestion on the A470, A481 and the A483.
Visitors to this year's Royal Welsh Show are being encouraged to take part in a campaign to support Welsh farmers.Read the full story ›