More than 100 animal rights activists have been arrested in the UK after causing delays to the Grand National horse race in Liverpool on Saturday. About 300 people from the ‘Animal Rising’ group were outside the event before it started, with several climbing a chain link fence to get onto the race track to “protect the horses at Aintree”. For context, the Grand National race is one of the biggest events on the UK’s sporting calendar. It’s also considered one of the most dangerous in the world because it’s a jumps race, where horses and jockeys have to get over 16 big fences to finish. Despite track safety changes made back in 2012, 3 horses were euthanised after sustaining injuries in this year’s 3-day event. But British Horseracing Authority boss Julie Harrington says the organisation “works tirelessly to improve the sport’s safety record and reduce avoidable risk”. She says the sport has “shown great determination and commitment to improve welfare standards”.