Extensive and destructive floods across eastern Japan have swept more than 700 bags containing Fukushima-contaminated soil and grass into Japan’s rivers, with many still unaccounted for and some spilling their radioactive content into the water system. Authorities in the small city of Nikko in Japan’s Tochigi Prefecture, some 175 km away from the Fukushima nuclear power plant, have said that at least 334 bags containing radioactive soil have been swept into a tributary of the Kinugawa river, The Asahi Shimbun reports.

According to the city’s authorities, the washed-away waste was only part of hundreds of bags being stored at the Kobyakugawa Sakura Koen park alongside the river. Another 132 bags of waste reportedly rolled down the slopes.The incident happened after Tropical Storm Etau caused vast flooding across Japan forcing the Kinugawa River to burst its banks on September 10. Twenty bags were found empty downstream on Thursday. Three hundred and fourteen bags, each with a capacity of one cubic meter, remain unaccounted for FULL REPORT