Six people have been arrested over a fight at Epsom on Derby Day.
Social media footage appears to show a fight breaking out inside a stand at the course.
Surrey Police said officers were called to the incident just before 6pm on Saturday.
Six people were arrested on suspicion of grievous bodily harm and affray.
They have been released pending further investigation.
A spokesperson for Epsom, which is owned by Jockey Club Racecourses, said: "Our security teams and police on site responded quickly to an incident on Saturday.
"This matter is now being dealt with by Surrey Police, so it would not be appropriate to comment further, other than to say that this sort of behaviour has no place at our racecourse."
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Around 28,500 saw Christmas Day claim victory on the Surrey Downs on Saturday.
The King and Queen attended the Derby, making the trophy presentation to winning trainer Aidan O'Brien, jockey Ronan Whelan and owners Coolmore.
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