Video has emerged of Olympian Charlotte Dujardin repeatedly whipping a horse during a training session.
Britain’s joint-most decorated female Olympian pulled out of the Paris Games over the footage, recorded during a lesson at a private barn.
The 39-year-old said it was “completely out of character” and “does not reflect how I train my horses or coach my pupils”.
But she admitted “there is no excuse” and said she was “deeply ashamed” and “sincerely sorry”.
Dujardin said the incident happened four years ago.
However the whistleblower’s lawyer, Stephan Wensing, told Sky News it was recorded two-and-a-half years ago while his client watched a lesson as a sponsor.
Mr Wensing’s client said they had seen abuse several times from Dujardin and filmed it because of how badly the horse was being treated.
Charlotte Dujardin horse training footage, and what Team GB athlete has said about incident
Team GB athlete Charlotte Dujardin pulls out of Paris Olympics after ‘whipping horse 24 times’
They said they hadn’t reported it before as they felt intimidated by her prestige and been warned by people in the dressage community to stay quiet – but felt they had to act with the Olympics coming up.
Dujardin, who has won six Olympic medals, including two golds in London and a third in Rio, had been set to compete in the individual and team events in France.
The International Federation for Equestrian Sports (FEI) has now provisionally suspended her for six months.
In 2019, Dujardin was also eliminated from the European Championships after authorities found a “very small amount of blood” on her horse.
The investigation into Dujardin comes more than two years after another Olympic champion, Sir Mark Todd, was suspended by horseracing authorities after a video showed him striking a horse with a branch.
Todd won two Olympic gold medals in 1984 and 1988 for New Zealand and was knighted in 2013.