Two people were flown Sunday to the University of Tennessee Medical Center where they remain in serious condition following a wreck involving a semi-truck and an SUV on Interstate 75.

“There was a SUV headed northbound when it was rear-ended by a semi-truck, which pushed the vehicle off the right shoulder and flipped over to the wooded area,” Travis Estes, Priority Ambulance Emergency Medical Services director, said. “Had two patients that were trapped, had one critical patient that was flown to the University of Tennessee and a second patient that was also flown to UT.”

According to a Tennessee Highway Patrol report, the wreck occurred around 1:55 p.m. in Loudon County near the 71 mile marker. The report indicates all four occupants of the SUV were injured.

UT LifeStar flew Judith Chapman, 62, of Klamath Falls, Ore., and Sarah Haselden, 42, of Cincinnati, Ohio, to the hospital with severe head trauma. As of Monday morning, they both remain in the hospital in serious condition.

The other two passengers, both of them children, were transported to the hospital and have since been discharged.