It is suspected that the braking system could have overheated and failed after the vehicle descended 23 hairpin bends
Six persons, including three women, a child and two men, died on the spot in one car, while another passenger was seriously injured
Authorities in New Iberia, Louisiana, have said the incident does not appear to be an intentional car-ramming.
The victims were heading home after attending a function at a banquet hall in the area when their car fell into a well near the venue