Two protesters have been arrested as they attempted to disrupt the Betfred Derby at Epsom.
One man managed to jump the fence before being tackled and handcuffed by police on the racecourse while the crowd jeered and booed.
Minutes later, a woman attempted to climb the fence but was pulled to the floor by police.
Despite pledges by activist group Animal Rising to “cancel or severely delay” the Derby, the race continued as planned shortly after the protesters were carried away.
Observers described the situation as “ludicrous” and “absolute insanity” while others thanked police for putting a stop to the protests.
Pictures appear to show one protester being tackled on the track shortly before the race began.
It comes after 19 people were arrested over plans to disrupt the event.
Animal Rising had warned it would attempt to sabotage the event despite a High Court injunction.
Surrey Police said 11 people were arrested at addresses in Mitcham and Byfleet in the early hours.
Eight people were also arrested around 10.20am after a vehicle was stopped in Burgh Heath, just south of Epsom.