A chemical leak near an Indiana mini-speedway sent at least 15 people to the hospital, officials said. Sulfur dioxide spilled at a chemical plant in Terre Haute on Saturday night, causing fumes to blow over a racetrack where families were watching a children's event, NBC station WTWO reported. "There were kids laying down, there were adults laying down," Korie Ellis, who was there to see her youngest son race, told WTWO. "There was some people throwing up, but just a lot of coughing, a lot of not feeling well. A lot of throats that were hurting at that point."