A St. Augustine woman was critically injured when she was struck while riding a motor scooter early Saturday morning in St. Johns County.

According to a release from the Florida Highway Patrol, Chelsea Wantz, 20, was struck from behind by a Ford Taurus driven by Christopher Langford, 19.

IMAGES:  Car rear-ends scooter, both burn

It happened around 3:30 a.m. Saturday on U.S. 1 South in St. Augustine.  Wantz was taken to Flagler Hospital, then transferred to Shands Jacksonville Medical Center. 

The release from FHP said the Taurus rear-ended the scooter while both were traveling north on U. S. 1.  The Taurus came to rest in the median and the scooter came to rest in the right lane. The front end of the Taurus caught fire. The scooter was completely burned.

Langford and his 18-year-old passenger were not hurt.

The initial FHP report indicated Wantz died after the crash, but her family called from Shands to say she was in critical condition.

The cause of the crash is under investigation and the FHP says charges were pending.

"We are going to have to wait until the investigation was complete to see if alcohol played a factor on either of the drivers," Channel 4 safety expert Ken Jefferson said.