A 19-year-old man was arrested Thursday and charged with dropping a rock onto a car from an Interstate 5 overpass at Rice Hill in November, injuring University of Oregon distance runners Molly Grabill and Chris Brewer.

Mathew McKinney was lodged in the Douglas County Jail on charges of second-degree assault, reckless endangering, first-degree criminal mischief, fourth-degree assault and first-degree throwing an object off an overpass.

McKinney is accused of standing on a freeway overpass and dropping the rock onto Grabill's northbound car. Grabill -- a 20-year-old Poway, Calif., native -- suffered facial injuries.

Chris Brewer, a passenger in the car, was injured less seriously when the car crashed after the rock smashed through the windshield, police said. Brewer, also a Southern California native, grabbed the car’s steering wheel after Grabill was struck by the rock struck. He was unable to maintain control, and the car overturned.

Grabill and Brewer both are members of UO track and cross country teams.