Sheffield Half Marathon runners: 'Everybody just set off'
6 April 2014 Last updated at 13:49 BST
Sheffield's Half Marathon has been cancelled due to a lack of water for runners, organisers have said.
There were chaotic scenes at the starting point as a "significant number" of the 5,000 runners decided to run the route regardless.
Organisers said they had been "let down" by the water supplier.
Speaking on the BBC News Channel, four members of the Barnsley Harriers, who took part in the race, said that there were boos when the announcement was made but that "everybody just set off".
Runner Lisa Steers said that people had decided to run "at their own risk", and that several people had collapsed.
Organisers said that medical facilities were in place and that anyone who had been ill was being very well looked after.