HIGHLAND PARK, Illinois (AP) — At least six people were killed and approximately 30 wounded after a shooter fired on a July 4 Independence Day parade from a rooftop in suburban Chicago, spraying the crowd with gunshots initially mistaken for fireworks, before hundreds of panicked revellers of all ages fled in terror.

An hours long manhunt during which residents hunkered down in businesses or received police escorts to their homes ended with a traffic stop and brief chase Monday evening, when authorities detained a man they described as a person of interest. They identified no motive for the attack in Highland Park, an affluent community of about 30,000 on Chicago’s north shore.

The July 4 shooting was just the latest to shatter the rituals of American life. Schools, churches, grocery stores and now community parades have all become killing grounds in recent months. This time, the bloodshed came as the nation tried to find cause to celebrate its founding and the bonds that still hold it together.

“It definitely hits a lot harder when it’s not only your hometown but it’s also right in front of you,” resident Ron Tuazon said as he and a friend returned to the parade route Monday evening to retrieve chairs, blankets and a child’s bike that he and his family abandoned when the shooting began.

“It’s commonplace now,” Tuazon said. “We don’t blink anymore. Until laws change, it’s going to be more of the same.”

The shooting occurred at a spot on the parade route where many residents had staked out prime viewing points early in the day for the annual celebration.

Among them was the family of Nicolas Toledo, who was in his late 70s and visiting from Mexico when he was shot. He died at the scene, his granddaughter, Xochil Toledo, told the Chicago Sun-Times. Also killed was Jacki Sundheim, a lifelong congregant and “beloved” staff member at nearby North Shore Congregation Israel, which announced her death on its website.

Dozens of fired bullets sent hundreds of parade-goers — some visibly bloodied — fleeing. They left a trail of abandoned items that showed everyday life suddenly, violently disrupted: a box of chocolate cookies spilled onto the grass; a child’s Chicago Cubs cap; baby strollers, some bearing American flags, and children’s bikes.

“There’s no safe place,” said Highland Park resident Barbara Harte, 73, who had stayed away from the parade fearing a mass shooting, but later ventured from her home.

Highland Park Police Chief Lou Jogmen said a police officer pulled over Robert E. Crimo III about 5 miles north of the shooting scene, several hours after police released the man’s photo and an image of his silver Honda Fit, and warned the public that he was likely armed and dangerous. Authorities initially said he was 22, but an FBI bulletin and Crimo’s social media said he was 21.

Police declined to immediately identify Crimo as a suspect but said identifying him as a person of interest, sharing his name and other information publicly was a serious step.

Lake County Major Crime Task Force spokesman Christopher Covelli said at a news conference “several of the deceased victims” died at the scene and one was taken to a hospital and died there.