(CNN) -- A malfunction at a festival swing ride in Connecticut sent children crashing into each other and onto the ground -- and raised new questions about the safety of such rides. 
 
 Families were enjoying a sunny Sunday afternoon at the Norwalk Oyster Festival when a ride called the Zumur experienced a mechanical failure that caused it to stop in mid-air, injuring 18 people, mostly children, the Norwalk Police Department said. 
 
 "It was a big boom, a big crash, three or four times over," Deyo Ello told News 12. "They slammed into the base of (the ride), and then you heard a whole bunch of screaming." 
 
 The ride -- which spins swings tethered to metal arms in an elliptical motion -- suddenly came to a jerking stop, "causing riders to collide with each other," according to the statement issued by police. 
 
 Shuan Marsh was in line at the ride when the accident happened. 
 
 "It was just injured kids everywhere. The parents ripping out the gate just trying to get to their kids," he said. "It was just horrible." 
 
 Twelve children and one adult were taken to hospitals for treatment, News 12 reported. An 8-year-old boy remained hospitalized late Sunday with non-life threatening injuries. 
 
 Ride inspected 
 
 Stewart Amusement, which owns and operates the rides at the festival, said state officials inspected the ride Friday, two days before the accident. 
 
 "It was a mechanical failure," said Richard Stewart, president of the company. "It never happened before. We hope it never happens again. " 
 
 Stewart said his company has been cooperative with authorities, who are still investigating, and plans to have the machine taken and apart and inspected once authorities are done. 
 
 In a statement on its Facebook page, the Norwalk Seaport Association, the festival organizer, said the well-being of the children and families involved was its only concern. 
 
 The festival temporarily shut down rides after the accident but reopened them Sunday evening after fire investigators and the ride company inspected them. 
 
 Safety record 
 
 "Portable rides have a very good safety record," according to amusement park safety expert Ken Martin. "In the state of Connecticut, however, they are only inspected once a year." 
 
 And that's the rub for many folk. The rules are different from state to state, with six states -- Alabama, Mississippi, Nevada, South Dakota, Wyoming, and Utah -- having no oversight at all. 
 
 Traveling rides like the one that malfunctioned in Norwalk come under federal scrutiny by the Consumer Product Safety Commission. 
 
 And they're actually inspected more than fixed rides, such as at amusement parks like Six Flags and Disney World. They fall under state jurisdiction and are often inspected by the state only when they're installed. 
 
 That's something that needs to change, in Martin's opinion. 
 
 "There is no federal oversight of fixed amusement parks and that is part of the problem," he said. "An amusement ride is an amusement ride. They need the same reporting systems, the same type of oversight, the same inspection guidelines for amusement rides all across the country." 
 
 In July, Six Flags Over Texas in Arlington shut down its Texas Giant roller coaster after a woman was thrown from her seat and plunged to her death. 
 
 Between 1990 and 2010, more than 92,000 children were injured in amusement ride-related incidents, according to a study by the Center for Injury Research and Policy at Nationwide Children's Hospital in Ohio. That's an average of more than 4,000 injuries per year. The study looked at both mobile and fixed rides. 
 
 It could have been us 
 
 For those who witnessed Sunday's accident at the Oyster Festival, it was heartbreaking. 
 
 "Just to see all those poor little kids just in so much pain and everything going on, it was really scary," Marsh said. 
 
 But for Ello, it hit even closer to home. 
 
 He had tried to go on the ride with his daughter, but they were turned away when she didn't meet the height requirements. Seeing injured children lying on the ground after the accident was devastating, he said. 
 
 "If she was tall enough, that would have been her," he said, grabbing his daughter's hands. "My heart is broken. I'm speechless. It ruined the day, you know." 
 
 CNN's Rick Martin and Sho Wills contributed to this report. ||||| A dozen children were injured when an amusement ride at a Connecticut fair broke down on Sunday, sending the swinging riders careening into each when the ride came to a sudden halt, authorities said. 
 
 One adult was also among the 13 people transported to hospitals after the mishap at Norwalk's Oyster Festival. 
 
 Norwalk police Lt. Paul Resnick said an 8-year-old boy was admitted to a hospital with non-life threatening injuries. The rest were treated and released. 
 
 Five other people refused treatment at the scene, police said. 
 
 The rotating, swing-type "Zumur" ride lifts riders up and away as it spins, authorities said. State police said a mechanical failure caused the ride to suddenly stop and those on board collided with each other. 
 
 Police initially said some of the ride's occupants had fallen to the ground but a preliminary investigation by state police indicates no riders were ejected from the ride or fell from it. 
 
 Resnick said children were being tended to by their parents on the ground when he arrived shortly after the accident. 
 
 The festival's organizer, the nonprofit Norwalk Seaport Association, said it directed the ride's operator, Stewart Amusement, to shut down the entire ride area until state inspectors completed a check. The other rides later reopened and the rest of the festival remained open on its third and final day. 
 
 Stewart Amusement didn't immediately return phone and email messages seeking comment. Its rides are inspected by its own staff every day, by state and local inspectors weekly and by engineers and insurance inspectors each year, the company's website said. 
 
 "Your safety is of critical importance to us," the site says. "Not only do we have an obligation to provide our guests with the safest equipment and environment possible, but also our ultimate success depends on it." 
 
 Stewart Amusement says it has provided rides and other attractions since 1983 at events in Fairfield and New Haven counties in Connecticut and neighboring Westchester and Putnam counties in New York. 
 
 Troopers with state police fire and explosion unit were investigating, department spokesman Lt. J. Paul Vance said. 
 
 Festival organizers posted a statement about the accident on its Facebook page. 
 
 "Our first and only concern is for the wellbeing of those involved and their families," the statement said.
– A dozen children were hospitalized yesterday after a swing ride malfunctioned at a festival in Connecticut, sending children crashing into each other and the center of the ride in front of their horrified parents. One adult was also injured as the ride at Norwalk's Oyster Festival lost power, the AP reports. Witnesses saw bleeding children with injured necks and legs and the most seriously injured child, an 8-year-old boy, is still in the hospital with non-life-threatening injuries. "It was just injured kids everywhere. The parents ripping out the gate just trying to get to their kids," a witness tells CNN. "It was just horrible." The owner of the ride, which spins swings attached to metal arms, says his company is cooperating with state investigators.