FILE PHOTO: An Ellington man was seriously injured in a crash on Interstate 91 in Cromwell Tuesday afternoon, state police say.

CROMWELL — An Ellington man was seriously injured in a one-car crash Tuesday on Interstate 91 in Cromwell, state police said.

Charles McWilliams, 80, was driving his 2007 Camry south on the highway at Exit 22S about 1 p.m. when he “veered into the right shoulder, struck a metal beam guardrail and rolled over,” police said in a report. The car rolled down an embankment before coming to a rest on its roof, police said.

McWilliams was taken to Hartford Hospital to be treated for what troopers said seemed like serious injuries. State police said they don’t know why he lost control of the car.

Troopers continue to investigate the crash.

Anyone who saw it or has information about it is can call Trooper Elson Abotsi at the Troop H barracks in Hartford, 860-534-1000.