The accident happened at the intersection of SR 63 and CR 1650N in Vermillion County. Police said the driver of the car, 20-year old Nathan Harper, signaled to turn into a gas station when he abruptly turned the opposite direction into the path of a semi.

The semi hit Harper’s car on the passenger side. He and a front-seat passenger sustained life-threatening injuries. Two others were taken to area hospitals with less serious injuries.

No charges have been filed; no updates on their conditions were made available.