BUDAPEST, Nov 12 (Reuters) - Hungarian modern pentathletes wrote an open letter to the president of the International Olympic Committee to protest plans to drop horse riding from the sport. The International Modern Pentathlon Union (UIPM) opted to remove horse riding from the sport"s Olympic programme from 2028 following an incident at this year"s Tokyo Games when a coach hit a horse after it refused to jump a fence. The incident led to widespread criticism of the sport. read more "Pentathlon without horse riding is like taking away one of the five rings of the Olympic Games," said Adam Marosi, who earlier this year won gold at the UIPM"s World Championships in Cairo. "The survival of our sport is at stake." Hungarian athletes joined others in calling for UIPM"s executive board to resign after it decided to remove horse riding from the Olympic programme. read more The athletes presented their letter at a press conference at the National Riding Hall in Budapest where the sport"s current national champions were accompanied by more than a dozen junior pentathletes wearing their breeches and riding jackets. Hungarian Pentathlon Association president Gyula Bretz said the organisation"s leadership unanimously decided to back the inclusion of horse riding and to not accept UIPM"s decision. Hungary has won 23 Olympic medals in the sport. Modern pentathlon has been an Olympic sport since 1912 and features five events: fencing, swimming, equestrian show jumping, pistol shooting and cross-country running.