Rodeo parade spectators watched in horror Thursday as a 5-year-old girl was thrown off her mount and trampled by an out-of-control team of horses pulling a wagon. She later died.
The girl, identified by police as Brielle Boisvert, was three years younger than the age minimum stated in the parade's online entry form.
Authorities said they would determine whether criminal charges were warranted.
Hundreds of people were within eyesight of the tragedy along the two-mile route of the Tucson Rodeo Parade.
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