Knoxville, TN (WOKI) Six people are injured, and an investigation is underway following a multi-vehicle crash Sunday afternoon in the Great Smoky Mountains National Park.

Park officials say three non-commercial vehicles were involved in the crash around 2:00 p.m. at mile marker 12 on Newfound Gap Road.

They say two people were transported via ambulance to LeConte Medical Center, and the other four reportedly planned to self-transport to hospitals for evaluation.

The cause of the crash remains under investigation, and US 441/Newfound Gap Road was temporarily closed Sunday during the incident, officials said.