The horrific incident was captured on numerous cameras and mobile phones, with footage showing onlookers screaming ‘Oh my God’ as dozens of people were struck by the vehicle in the city of Waukesha on Sunday.

One chilling clip shows the red SUV hurtling past a little girl dressed in pink as she dances in the street. Another, of dancers with pompoms, ends with a group of people tending to a girl on the ground.

A father later described going ‘from one crumpled body to the other’ in desperate search of his daughter. Among those hurt were elderly women who were part of a ‘Dancing Grannies’ float.

Police said a ‘person of interest’ had been detained and the vehicle recovered. But Waukesha Police Chief Dan Thompson gave no details about the person or any possible motive.

Attorney General Josh Kaul, the state’s top law enforcement officer, tweeted: ‘What took place in Waukesha today is sickening, and I have every confidence that those responsible will be brought to justice.’

locator map shows location of incident in relation to Kenosha

Map showing the parade route