Robert E. Crimo III, the suspect in a mass shooting at a parade that left six people dead and more than two dozen injured, was arrested near Lake Forest, Illinois, according to a brief news conference held by officials on Monday evening.

He was brought into custody without incident and will be sent to the Highland Park police department, where the fatal shooting occurred on Monday morning.

Crimo was allegedly noticed by a North Chicago police officer who attempted a traffic stop. Crimo led officers on a short pursuit before being apprehended. 

Earlier, as law enforcement searched for Crimo, authorities had dubbed him a "person of interest," and the FBI stated that he was being sought for his alleged role in the killing of many people at a Highland Park, Illinois Independence Day celebration.

As a result of the shooting, which disrupted Fourth of July celebrations in cities across the region, a manhunt was conducted throughout the Chicagoland area.

The shooting in Highland Park, around 25 miles north of Chicago, began shortly after 10 a.m. CT on Fourth of July, as parade-goers enjoyed a sunny Central Avenue march.

Earlier, police commander Chris O'Neill stated that firearm evidence was discovered on the rooftop of a nearby shop. 

Christopher Covelli, spokesman for the Lake County Major Crime Task Force, stated that the gunman used a ladder linked to the building's side in an alley to reach the roof.

Covelli stated that the weapon was a "high-powered rifle" and that the attack appeared "random" and "deliberate."

Kim Nerheim, a representative for the Bureau of Alcohol, Tobacco, Firearms, and Explosives, said that authorities are tracing the firearm to determine who purchased it and where it originated.

Covelli informed reporters that SWAT and other officers have been evacuating buildings within a specified distance of the gunfire.

Jennifer Banek, coroner for Lake County, stated that all five victims at the scene were adults. She stated that one person had died at a hospital, but she did not have any additional information on that victim.

Chief Joe Schrage of the Highland Park Fire Agency stated that his department carried 23 casualties to hospitals, while additional victims were brought in police cars or personal vehicles.

Dr. Brigham Temple, the medical director of the NorthShore University Health System, reported that a total of 26 people were admitted to Highland Park Hospital. 

According to Temple, the patients ranged in age from 8 to 85 years old, with four or five being children.