Emergency services are at a major incident at Cantref Reservoir in the Brecon Beacons. Dyfed Powys Police have confirmed an operation in underway, but are currently unable to release any further information. It is believed they are searching for a missing man.
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Three appliances are attending the scene after receiving a call at 7.42pm.
Catch up on Monday's Wales at Six with Jonathan Hill.
Any cloud and showers will clear to leave a dry night, feeling cold under clear skies.