Police searched the offices of the operator of the Expoland amusement park in Suita, Osaka Prefecture, and other locations Sunday, the day after a roller-coaster accident in the park killed a woman and injured 19 other people.
The police mobilized around 70 officers to carry out the search on suspicion of negligence resulting in death and injuries. They also investigated the site of the accident.
Expoland usually disassembles roller coasters in January or February to check if any cracks have been caused inside vehicle components by using ultrasonic and magnetic wave devices, according to company officials. This year, however, the annual checkup had been put off until May 15, after the Golden Week holiday period, because of a lack of space needed for disassembling, they said.