A 22-year-old person of interest has been apprehended in connection with a mass shooting Monday at a Fourth of July parade in the Chicago suburb of Highland Park, Illinois, police said.
Six people were killed and about 24 others were seriously hurt in the shooting, according to officials.
Police said they apprehended Robert "Bobby" Crimo III following a vehicular pursuit Monday evening after an hours-long manhunt.
It appears the gunman fired from a roof where a high-powered rifle was recovered, police said.
Police are describing the shooting as a "random act of violence."
Ryan Lerman, a delivery driver, was near the intersection and filmed the arrest as it took place. He told Chicago ABC station WLS that he immediately recognized the car from the police bulletins.
"Right away he was surrounded by the police," he told the station. "They came from either side of the highway to surround him."
The video showed armed officers approaching the car with their guns drawn and ordering the driver to get out. The driver was seen putting his hands in the air.
"It ended with him getting on his knees and getting arrested by cops," Lerman said. "It was surreal, I didn’t know what I was seeing."
The arrest capped a frantic day that began with a popular parade in the neighborhood.
The parade was about three-quarters of the way through when the shooting broke out, authorities said. Revelers fled in panic, leaving behind empty strollers, overturned chairs and half-eaten sandwiches.
Police ran toward the shots but the gunman had already fled, Lake County Sheriff Deputy Chief Christopher Covelli said at a news conference.
Five people -- all adults -- died at the scene and a sixth victim died at a hospital, said Lake County Coroner Jennifer Banek.
One victim has been identified by family members as 78-year-old Nicolas Toledo. His family told ABC News that Toledo moved to the U.S. from Morelos, Mexico, in the 1980s.
A Mexican national is also among the deceased, according to the Ministry of Foreign Affairs of Mexico.
The NorthShore University Health System said it has a total of 31 patients; most suffered gunshot wounds and a few were hurt in the chaos. At least one child is critically injured, Highland Park Fire Chief Joe Schrage said.
When the gunfire erupted, parade-goer Zoe Nicole Pawelczak grabbed her dad and started running through the sea of people.
"I saw multiple people slaughtered," she told ABC News.
"Everybody is crying. We ended up making it behind a corner and we hid behind a dumpster. This man was there with his two very young children and he had put them in the dumpster for safety," she said.
Pawelczak said the man wanted to leave to find his other son, and asked her to watch the two children in the dumpster.
"So I watched his kids for him," she said. "They were like, 'What's going on?' And I was like, 'It's just fireworks, it's OK,' just trying to keep them calm."