Wrestling's governing body has been warned for a "minor" rules infringement in the sport's bid to stay in the 2020 Olympics. Wrestling was cut from the list of core sports in February and is competing against squash and a combined baseball-softball bid. The IOC says in a letter to the two other sports that the wrestling body and an organization supporting it "engaged in activities that were not in lines with the rules of conduct." Wrestling federation President Nenad Lalovic says the Japanese wrestling federation wrote to some IOC members promoting the sport. IOC rules prohibit the sports from sending such material in the three weeks before Sunday's vote. Lalovic says he reported the infringement to the IOC. The IOC letter says a warning was sent to the wrestling federation Aug. 20 and "the matter is now considered as closed."