STOCKTON, Mo.- Saturday was a day of celebration in Stockton, Missouri until an accident left a 12-year-old boy with serious injuries.

According to The Missouri State Highway Patrol report, a 12-year-old boy was riding a parade float at the annual Black Walnut Festival in Stockton. The boy fell off the right side and was run over by the same parade float.

The accident happened around 3:34 pm on North Street in Stockton.

The MSHP report says the boy sustained serious injuries and was transported by aircraft to Mercy Hospital in Springfield, Missouri for treatment.

This is still a developing story.