This follows the Animal Rising group, which previously announced plans to halt the launch of the obstacle course, with up to 300 activists planning to scale the fences and enter the track.
It said: “We will be slow marching around the perimeter and at some point we may peacefully try to make our way towards the track, again to prevent this race from happening because we know horses are being harmed.”
Three people suspected of conspiring to cause public nuisance were arrested ahead of the Grand National race, including spokeswoman Claudia Penna Rojas, 25.
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