Dyfed Powys Police have confirmed a major operation at Cantref Reservoir in the Brecon Beacons was sparked by a missing man.
In a statement, the force said there were called to the reservoir at around 2.45pm after reports of a missing man and emergency responders conducted searches at the scene.
The A470 at Merthyr and the junction of the A4059 were closed while the search was carried out.
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