The start of the Randox Grand National was delayed after a number of protestors made their way on to the track at Aintree.
Animal Rising had threatened to disrupt the four-and-a-quarter-mile and were protesting from early on Saturday morning outside the track.
As the National runners were in the parade ring, a number of protestors breached security fences around the Liverpool venue and ran on to the course.
The horses were sent back to the pre-parade ring, with the race delayed as police dealt with the intruders.
The track tweeted: "Update on The Randox Grand National: There will be a slight delay to the Grand National race. We will update as soon as possible."
The jockeys were given the signal to mount at around 5.20pm – over five minutes after the scheduled start time.