Published: Jul 05, 2010 12:25 AM EDT
Updated: Jul 04, 2010 9:25 PM EDT

BELLEVUE, Iowa (AP) - Police say two horses that injured 24 people at a Fourth of July parade in eastern Iowa became uncontrollable after one of them rubbed its head against the other, removing that horse's bridle.
      
The horses and the wagon attached to them took off for six blocks, running into children and adults seated and standing along the streets watching the parade in Bellevue, about 25 miles south of Dubuque on the Iowa-Illinois border.
      
Police say the victims were as young as 2 years old, and suffered injuries ranging from multiple fractures to collapsed lungs and bruises and abrasions.
      
Ten patients, including nine children, were taken to Mercy Medical Center-Dubuque. Six children were treated and released. One child in critical condition was flown to the University of Iowa Hospital in Iowa City.