HIGHLAND PARK, Ill. (CBS) — The suspected shooter is in custody after six people were killed dozens of others were wounded when a gunman opened fire from a rooftop during the July 4th parade in north suburban Highland Park on Monday.

Highland Park Police Chief Lou Jogmen said 22-year-old Robert “Bobby” E. Crimo III was arrested around 6:30 p.m., more than eight hours after the shooting, following a chase in the north suburbs.

Jogmen said police in North Chicago spotted Crimo’s vehicle near Buckley Road and U.S. Route 41, and tried to conduct a traffic stop, but Crimo fled the scene. North Chicago police called for reinforcements, and Crimo’s vehicle was stopped about six miles away near Westleigh Road and U.S. 41. He was taken into custody without incident, and charges were pending Monday evening as police continue to investigate.

Six people were killed and 24 were seriously wounded when a gunman opened fire from a rooftop during the July 4th parade in north suburban Highland Park on Monday. Police are looking for a person of interest, Robert E. Crimo III.

Earlier, heavily armed investigators were swarming around Crimo’s home in Highwood, Ill. Authorities were also at Crimo’s father’s home in Highland Park. 

Chris O’Neil said the shooting happened around 10:15 a.m. during the parade. 

A rifle was recovered at the scene.

Lake County Major Crimes Task Force spokesman Chris Covelli confirmed witness reports that the shooter opened fire from the roof of a nearby business.