Police announced the arrest of suspect Robert "Bobby" Crimo III at around 6:30 p.m. local time.
"The subject we were looking for, the person of interest---Robert Crimo III---was spotted by a North Chicago unit at Buckley Rd. and 41, his vehicle, the vehicle that we were looking for---attempted to initiate a traffic stop on that subject, that subject did flee---a brief pursuit went on, ultimately they were able to get the subject stopped at Westleigh Rd. and 41 in Lake Forest, the subject was taken into custody without incident," said Chief Lou Jogman of the Highland Park Police.
Chief Jogman said in a conference on Monday afternoon that the suspect was taken to the Highland Park Police Department for questioning where an investigation into the shooting will continue.
A video shared on Twitter is believed to show the moment police arrested the alleged suspect.
Tre Ward of ABC 7 shared an image of the alleged shooter, Crimo, and his vehicle to Twitter. Crimo was driving a 2010 Silver Honda Fit when he attempted to flee police.
According to police, the shooter opened fire around 10:10 a.m. on the Highland Park Fourth of July parade. Dozens of families had gathered along the parade route as the shooter opened fire from the rooftop of a local business. Police discover a "high-powered rifle" on the rooftop but did not divulge any details on the make of the weapon or the magazine. It is believed the shooter accessed the rooftop by utilizing a ladder in the alley.
Six individuals were killed, with five being pronounced dead at the scene. 26 wounded individuals were brought to Highland Park Hospital, ranging in age from 8 to 85. Of those 26 injured individuals, 19 have been treated and discharged and four or five patients were children.
Highland Park, Illinois, is approximately 25 miles north of Chicago. The suburban city has a population of 30,000 and was used for location shoots in the John Hughes films Ferris Bueller's Day Off, Weird Science, Sixteen Candles, Uncle Buck and Home Alone.