An Independence Day parade in Iowa descended into chaos when two horses went out of control and took their wagon with them, running into crowds of celebrants and leaving more than 20 people injured, according to authorities.

A woman injured in the incident died Sunday evening, police said.

It happened at the Bellevue Heritage Day Celebration Parade in Bellevue, Iowa, on the state's eastern border with Illinois. Fire Chief Chris Rowling said two horses pulling a wagon went out of control along the parade route, running with the wagon for about six blocks and hitting numerous children and adults.

A total of 24 people were taken to hospitals in the area with injuries that ranged from abrasions to fractures to collapsed lungs, he said.

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