A cyclist taking part in ysterday's Wiggle Dragon Ride, based at Margam Country Park, Port Talbot, was flown by air ambulance after crashing during the event.
There are no details as yet as to the extent of the cyclist's injuries or their condition.
In a statement, event organisers Human Race said:
There was an incident involving a cyclist at the Dragon Ride on 9th June which was attended by the Welsh Ambulance Service. The rider was airlifted to University Hospital of Wales in Cardiff where he is being treated for his injuries. The incident occurred on the descent of the Bwlch at Abergwynfi. Human Race, organisers of the Dragon Ride will conduct a full investigation into the circumstances of the incident and currently understand no vehicles or other cyclists were involved. The injured rider was attended to by a number of medical professionals who were also taking part in the Dragon Ride prior to St. John's Ambulance and the Air Ambulance arriving at the scene.
According to road.cc's Dave Atkinson, who is familiar with the section of road in question having ridden past editions of the event, "the descent off the Bwlch is pretty fast and open, Abergwynfi itself isn't a steep section but you can be carrying quite a lot of speed into the village."
In the comments below this article, road.cc user David Gunthorpe reveals how he was the first rider on the scene, coming across the stricken cyclist – whom he says is “doing ok, apparently” in hospital – immediately after a cattle grid which was preceded by a right hand corner at the bottom of the descent.
Speaking to BBC News South West Wales, he said: "I came round the corner, still descending, and I saw this guy in the middle of the road and he wasn't moving.
"I pulled over and I checked his pulse, which was fine. He was face down and bleeding from his nose and face.
"He was conscious but we were concerned about his breathing."
Two doctors and a surgeon also taking part in the ride stopped and performed emergency CPR prior to the arrival of St John Ambulance and subsequently the emergency helicopter.
He added: "The rear tyre had blown off the rim about 10 inches. It might have happened as we came over a cattle grid further back. His rear wheel was locked."
According to other comments below, there were a lot of crashes during the event, particularly early on, leading some cyclists to ride cautiously given the conditions.
Born in Scotland, Simon moved to London aged seven and now lives in the Oxfordshire Cotswolds with his miniature schnauzer, Elodie. He fell in love with cycling one Saturday morning in 1994 while living in Italy when Milan-San Remo went past his front door. A daily cycle commuter in London back before riding to work started to boom, he's been news editor at road.cc since 2009. Handily for work, he speaks French and Italian. He doesn't get to ride his Colnago as often as he'd like, and freely admits he's much more adept at cooking than fettling with bikes.