On the very first day it opened, the world’s fastest and tallest roller coaster had to be shut down after an accident.

According to CBS Philly, “Steel Vengeance” opened briefly on Saturday at Cedar Point Amusement Park in Sandusky, Ohio,  only to be shut down after two roller coaster cars collided. One of the cars was reportedly returning from a ride when it collided with another coaster car that was parked in a loading area.

Four passengers who were reportedly in the car were not seriously hurt. The passengers were evaluated by medical professionals on-site but did not seek treatment at a hospital, and returned to the amusement park after the evaluation.

The roller coaster re-opened on Saturday night, according to ABC 6.

Steel Vengeance is a ‘hyper-hybrid’ roller coaster, made of steel cars that run on a wooden track.

[Feature image: Steel Vengeance/NBC 4 video screenshot]