BLUFFTON, Ohio—A police officer in Ohio was struck and killed by a fleeing car on Interstate 75 during a high-speed chase through multiple counties Wednesday, authorities said. The officer, Dominic Francis of the Bluffton police department, was struck around 2:30 a.m. while he was setting up stop sticks, which flatten tires, said Sgt. Brice Nihiser of the Ohio State Highway Patrol. The chase had reached speeds up to 120 mph. Three suspects inside the car drove away for a short distance before they jumped out and ran. One was found nearby while a second one was arrested in a stolen car in Elyria, about 100 miles northeast of Bluffton, Nihiser said. Authorities were continuing to look for the third suspect. The search caused schools in the nearby village of Bluffton to cancel classes, and Bluffton University told students to stay in their rooms and advised employees to stay home. I-75 …