Whether you’re new to roller coasters or a thrill seeker, you’ve likely experienced technical problems shutting down a ride from one time to another.

However, a recent report has shared that the world’s fastest-accelerating roller coaster has suspended service for a truly shocking reason.

VICE World News has shared that Fuji-Q Highland Park’s “Do-Dodonpa,” the world’s fastest-accelerating roller coaster in Japan, has been suspended after multiple riders sustained broken bones from the attraction. The coaster accelerates to a speed from 0 to 112 miles per hour in 1.56 seconds. While the attraction was originally built 20 years ago in 2001, these injuries have only been recently reported by riders.

According to VICE, authorities were alerted on August 17th that at least six riders experienced bone fractures, while four other had broken their necks on the “Do-Dodonpa” since December. No technical issues have been found by Fuji-Q Highland after investigated the ride, and Sansei Technologies (the coaster’s manufacturing company) stated it wasn’t sure what was causing the injuries. However, the park and manufacturing company were both sorry that these riders had experienced injuries of this level.

Naoya Miyasato, an architecture professor from Nihon University, stated to VICE that the injuries could be from the way riders are sitting on the coaster. He shared that, “If they detected no serious concerns with the actual ride, then it could be the way people were sitting. But if a person was sitting incorrectly, say with space between their backs and their seat, it’s the responsibility of the park employees to check their seating position.” The rapid acceleration is also a probable factor in the injuries as it’s more than three times the force of gravity at its peak.

Don’t worry, though  — if you LOVE roller coasters, this situation isn’t normal. Since designs must meet certain government-approved standards, these kind of severe injuries aren’t common. As a matter of fact, the International Association of Amusement Parks and Attractions has shared statistics that the probability of being seriously injured while riding a roller coaster in a U.S. amusement park is around one in 15.5 million rides.

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