Police have closed a road near Hirwaun for safety after several vehicles collided with a fallen tree.
The A465 Heads Of The Valleys Road is closed between A4059 Hirwaun Road / Brecon Road (Hirwaun Roundabout) and B4276 Merthyr Road (Llwydcoed / Baverstocks).
South Wales Fire & Rescue Service said four cars were involved, with four walking wounded and two further casualties.
Police are at the scene, they added, and highways are on their way to clear the road.
Days of severe weather have taken their toll in coastal areas around Wales.
Why has Britain been battered by a seemingly endless series of severe storms since the start of December?
These videos show the ferocity of the waves hitting Aberystwyth seafront this morning, leaving the roads strewn with debris.