GILMER COUNTY, Ga. -- One person was killed and up to 40 others were injured in an accident involving a tractor-trailer truck and a tour bus Thursday, according to Gilmer County's fire chief. 

The accident happened at the intersection of Whitestone Road at Highway 515 around 11:15 a.m. 

All southbound lanes of Highway 515 were closed as an "extensive triage effort" was underway, according to Gilmer County Fire Chief Tony Pritchett.

A witness who drive by the accident told 11Alive that the printing on the side of the bus indicated that the bus was from Marietta, Ga. The witness said it appeared the bus was "full of elderly people".