Team GB's Lizzie Armitstead was taken to hospital following a crash after she won stage one of the Women's Tour in Aldeburgh, Suffolk.
The crash took place on the opening stage of the Aviva Women's Tour, the biggest women's race in the UK. Armitstead has now pulled out of the event.
The 26-year-old Olympic silver medalist raised her arms in celebration after crossing the finish line, but crashed into photographers and race director Mick Bennett moments later.
The aftershock as the rest of the 85-strong leading peloton tried to avoid her caused a further pile-up on the right hand side of the road, involving at least half a dozen fellow competitors.
The Yorkshire star lay on the road for some 40 minutes receiving attention from medical staff after the incident.
Taken away in an ambulance
Armitstead was given oxygen and an IV drip after the crash and put in a neck brace before being loaded into an ambulance, leaving her teammates to collect her winner's jersey.
Later on Wednesday evening Armitstead posted a message on Twitter which read: "I remember winning with the help of my team mates and then not much else, but I am ok, nothing broken just very sore."
Armitstead had proved the fastest of four women leading the mass sprint, crossing the finish line almost half a bike length ahead of her closest rival, Germany's Lisa Brennauer.
It was a bitter end for Armitstead, who fought a valiant uphill battle with the dominant world No1, Marianne Vos, through most of last year's inaugural edition of the race before being forced out due to illness.