The Six Flags Great Adventure roller coaster malfunctioned at the end of a ride at a New Jersey theme park last month, injuring more than a dozen people and hospitalizing five of themwill remain closed due to structural damage to support columns that could put riders at risk, state public affairs officials said Wednesday.

New Jersey Department of Community Affairs (DCA) officers conducted a preliminary field investigation of the August 25 incident involving the El Toro stand and initially found structural damage to the column. The agency now claims that these damaged columns structurally impair the park’s ability to operate the ride in a safe manner.

El Toro will remain closed for an undetermined period of time, DCA said. It will carry out a technical inspection during the operation to determine the cause of the structural problems, which remain unknown at this time. Consultation with the manufacturer is underway.

The scare at El Toro happened on August 25th around 7:30pm that August night as the ride was ending. Something broke and more than a dozen injuries of varying degrees of severity occurred among the riders.

Last year, the wooden roller coaster closed when the rear wheels of the car came off the track. No one was hurt, but the state fined the park $5,000 for not immediately calling ride officials.

El Toro, according to the park’s website, is one of the fastest and tallest wooden coasters in the world. The ride reaches speeds of 70 mph and climbs 19 stories for one of the steepest drops in the country.

El Toro wooden roller coaster at Grand Adventure Park. (Photo by John Graeme/LightRocket via Getty Images)

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