Two teens were seriously injured Friday after two cars apparently got into a bashing match on the 2100 South freeway.

Investigators weren't sure what prompted the drivers to start bumping each other, Utah Highway Patrol trooper Troy Giles said. After one of the vehicles, a Jeep, was nicked in the back, it flipped over and landed on its side, police said.A 14-year-old girl was ejected and seriously injured. Paramedics took her by medical helicopter to Primary Children's Medical Center. A boy was also thrown from the Jeep, but his injuries weren't as serious, Giles said. The names weren't released Friday, pending notification of their families.

After the Jeep tipped, the driver of the second vehicle stopped and the two drivers started fight, police said.

"They were on the ground when we pulled up," Giles said.

Nobody else was injured in the 8:45 p.m. crash. The driver of the Jeep was arrested Friday night.

Westbound lanes on the freeway were closed for about two hours while troopers cleared the crash.