At least six persons were killed and 15 others injured when a mini truck carrying a marriage party collided on Friday with a dumper near Sundargarh, about 80 km from Rourkela.
The accident occurred when the vehicles were trying to negotiate a sharp turn, police said.
About 30 members of the marriage party from Gurundia in Sundargarh district were on their way to Lethripada for the wedding when the collision took place.
The seriously injured were rushed to district hospital at Sundargarh town where the condition of three persons was stated to be critical.
The driver of the dumper fled from the spot following the incident.
The six bodies were sent for post-mortem.