Extremely high levels of radiation have been discovered in a playground in Tokyo, officials said on Friday, fanning fears for the health of children in the area.
Soil underneath a slide at the park in the north-west of the Japanese capital showed radiation readings of up to 480 microsieverts per hour, the local administrative office said.
Anyone directly exposed to this level would absorb in two hours the maximum dose of radiation Japan recommends in a year.
"Many children play in the park daily, so the ward office should explain the situation," Kyodo News quoted a 62-year-old local woman as saying.
The radiation level is over 2000 times that at which the national government requires soil cleaning in areas around the Fukushima Daiichi nuclear plant, where reactors melted down after the March 2011 tsunami.
"Because the area in which we detect radioactivity is very limited, and readings in surrounding parts are normal, we suspect radioactive materials of some kind are buried there," local mayor Yukio Takano said in a statement.