Investigators will need to use dental records to identify some of those killed after a church bus lost control and jumped the median, crashing into an SUV and a tractor-trailer in Eastern Tennessee.

"The crash is so horrific ... it's probably the worst that I have seen in my career ... and I've worked in several, several counties in my 17 years on the job," Sgt. Bill Miller with the Tennessee Highway Patrol told CNN.

The bus was transporting a seniors group called 'Young At Heart' from a religious conference in Gatlinburg, Tenn. While traveling eastbound on Interstate-40 one of the tires malfunctioned. Miller told CNN it isn't clear at this time exactly what caused the bus to skid across a grassy median, hit a SUV and a tractor-trailer then flip onto its side.

Six people on the church bus were killed as well as one in the SUV and the driver of the tractor-trailer. Of the 14 other people involved in the crash, only two have been released from the hospital, according to a CNN report. Two victims are still in critical condition, seven are in serious condition and three are in stable condition. Miller said it's too early to know whether charges will be filed in connection with the wreck.

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