In pictures: 4th of July shooting in Highland Park, Illinois
A woman views the candles and flowers left for the victims of the July 4th parade shooting on Tuesday, July 5, 2022 in Highland Park, Illinois.
Taylor Glascock for CNN

In pictures: 4th of July shooting in Highland Park, Illinois

Updated 11:02 PM ET, Tue July 5, 2022

A woman views the candles and flowers left for the victims of the July 4th parade shooting on Tuesday, July 5, 2022 in Highland Park, Illinois.
Taylor Glascock for CNN

A mass shooting at an Independence Day parade Monday in a Chicago suburb left at least seven people dead, wounded dozens more and sparked a manhunt for a gunman who fired on unsuspecting attendees from a rooftop, authorities said.

The shooting in Highland Park, about 25 miles north of Chicago, began shortly after 10 a.m. CT as people enjoyed a sunny Fourth of July parade along Central Avenue.

Firearm evidence was found on the rooftop of a nearby business, police commander Chris O'Neill said. The shooter used a ladder attached to the building on a wall in an alley to access the roof, said Sgt. Chris Covelli of the Lake County Major Crime Task Force.

The gun was a "high-powered rifle" and the attack appeared to be "random" and "intentional," Covelli said.

Highland Park Police Lou Jogmen on Monday evening identified Robert E. Crimo III, 21, as a person of interest.

According to authorities, Crimo was taken into custody near Lake Forest just before 8 p.m. ET. Investigators believe Crimo planned the attack "for several weeks," a spokesperson for Lake County authorities said Tuesday.