A woman died and 19 other passengers were injured, one seriously, in a roller coaster accident Saturday at an amusement park in Suita, Osaka Prefecture, police and firefighters said.

The six-car Fujin Raijin II roller coaster at Expoland, on which passengers stand through the course of the ride, derailed and hit a guardrail around 12:50 p.m. after a wheel axle on one of the cars broke, the park operator said.

The coaster, which can travel up to 75 kph, was in the last half of the 1,050-meter-long course when the accident occurred.