A 48-year-old Harvard man and an 18-year-old man are dead after their Toyota Prius crashed head-on with a semi-truck near Harvard early Friday morning.

The McHenry County Sheriff’s Office and Harvard Fire Protection District were called at 2:29 a.m. Friday to a crash involving a 2003 Toyota Prius and a 2016 Freightliner Cascadia semi-truck near Route 23 and Bunker Hill Road in Dunham Township, which is south of Harvard.

The McHenry County Sheriff’s Office said that the Toyota, driven by the 48-year-old man, was traveling northbound on Route 23 and the Freightliner, driven by a 57-year-old Cross Plaines, Wisconsin woman, was traveling southbound.

The Toyota crossed the center line of Route 23 and struck the Freightliner head-on for an unknown reason, officials added.

The driver and passenger of the Toyota were both pronounced dead at the scene. There were no other occupants in the car. The driver of the semi-truck did not sustain any injuries.

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All occupants were wearing seat belts and airbags deployed in the Toyota. Route 23 was closed for around seven hours while investigators worked.

The investigation is ongoing by the McHenry County Sheriff’s Office Major Crash Investigation Unit and the McHenry County Coroner’s Office.