A three-horse spill triggered by a fallen horse left three jockeys injured in the seventh race the evening of Feb. 4 at Turfway Park in Northern Kentucky. The final two races of the program were canceled.In the 6 ½-furlong claiming race for 4-year-olds and up, World Trade, with Mike Rowland aboard, fell on the far turn. Joanie's No Phony, ridden by Jessica Endres, and Miner Moss, ridden by Mark Johnston, both collided with World Trade and didn't finish the race, run on a muddy track.According to track officials, Rowland, a 24-year veteran, and Johnston, who has been riding for 17 years, were taken by ambulance to University Hospital in Cincinnati, Ohio. Further information wasn't available as of 9:30 p.m. (EST). Endres, who started riding a few years ago, was bruised and somewhat shaken up but apparently unhurt.Track officials said the eighth and ninth races were canceled because medical treatment of the riders was the priority. They said further information would be released as it became available.The $13,900 race for $17,500 to $15,000 claimers was won by Hallshill Road and Jeff Johnston. Hallshill Road was just off the pace when World Trade fell but only had to steady. Second-place finisher Madeleine's Jade also had to steady to avoid the fallen horse.