Haydock Park officers are investigating after a mass brawl broke out among spectators.
About 50 of us had been enthusiastic with the fight earlier than and at some level of the eighth and last elope of the day. A lady and toddler had been caught up in the disturbance.
A spokesman acknowledged Haydock took a “zero tolerance problem” on combating and that those enthusiastic had been “ejected”.
One man changed into arrested over a public portray offence, Merseyside Police acknowledged.
Racing has been on excessive alert over on-track combating after incidents at Goodwood, Ascot and Hexham in 2018.
The spokesman acknowledged Haydock is “persevering with to work with the police on this matter”.