A Plymouth woman was injured Wednesday night when the vehicle she was riding in was rear-ended by another motorist. Mary Holtrop, 58, was riding in a 2009 Chevrolet that was eastbound on State Road 17 at Carriage Drive and stopped to for westbound emergency vehicles with lights and sirens on. A 2007 Kia driven by Alberta Huff, 77, of Plymouth, struck the Chevy, according to a report from the Marshall County Sheriff’s Department. Huff told the investigating officer she was slowing for the passing vehicles and did not realize the other car, driven by Joseph Holtrop, 77, of Burbank, Ill. had stopped.