A high level of radiation was detected at a Tokyo park, the Toshima Ward Office said Thursday, according to the Japan Times.
The incident caused speculations that hazardous materials were buried in the area. The ward office banned access to the park, which is in Ikebukuro area.
The radiation level was over 480 microsieverts per hour, recorded on a sport near a playground Thursday afternoon, the municipality said.
The park was opened in March 2013. Previously, the area was used as a parking space for garbage collection vehicles.