Police said 22-year-old Robert "Bobby" E Crimo III was taken into custody following a police pursuit that ended in north suburban Lake Forest.
He was being taken to the Highland Park Police Department for questioning, but no charges had been filed as of 6:50 p.m. Stay informed about local news and weather.
Crimo, who police said is from the area but did not specify if he is from Highland Park, was believed to be driving a 2010 silver Honda Fit with the Illinois license plates DM80653.
He is wearing a white or blue T-shirt, according to Highland Park Police Cmdr.
The shooting happened at 10:14 a.m. in the area of Central Avenue and 2nd Street in downtown Highland Park during the city's Fourth of July parade, authorities said.
Numerous law enforcement officers are responding and have secured a perimeter around downtown Highland Park.".
The public is being asked to avoid downtown Highland Park as police continue to respond to the shooting "in the area of the Independence Day parade route," the Lake County Sheriff posted on Twitter. »