Online bookmakers Betfair could be forced to payout around £23m to punters following a mistake on their website.
A sum of £1,642,094 was matched in running at a price of 28-1 on the winner Voler La Vedette at Leopardstown, with her price failing to drop as she crossed the line four and three quarter lengths in front of Mourad.
The betting company are yet to pay their customers while an investigation is carried out.
Betfair issued a statement at 2.48pm which read: "The win and place markets on this race are currently suspended.
"The markets will remain unsettled while we investigate the in-running betting patterns on this race. We apologise for the delay."
The majority of other bookmakers priced Voler La Vedette at 2-1.
