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Four people have been taken to hospital after a crash has closed the main A465 Heads of the Valleys road near Merthyr.

Both directions of the road between Swansea and Merthyr Tydfil are shut and drivers are urged to avoid the area.

Emergency services are at the scene between Cefn Coed and Hirwaun and South Wales Police said the road was "not likely to reopen for some time".

The two-vehicle crash happened between Hirwaun and Llwydcoed in Rhondda Cynon Taf at about 11:00 BST.

The air ambulance and five ambulances were sent to the incident near the Baverstocks junction of the A465.

"Four patients were transported by road to the University Hospital of Wales, Cardiff," a Welsh Ambulance Service spokesman said.

Stagecoach have also said that bus services in the area have been affected.