Pyongyang, November 28 (KCNA) -- Radioactive strontium, one of the substances closely monitored by the government around the Fukushima Daiichi atomic plant, has been detected in soil samples taken at three locations in downtown Tokyo, a citizens' group said Thursday, after finding the same element last month in Yokoyama.

Soil collected from outside the Ministry of Economy, Trade and Industry, Tokyo International Forum, both in Chiyoda Ward, and the Kiyosumi-Shirakawa subway station in Koto Ward measured 48, 51 and 44 becquerels per kilogram, respectively, it said, against 10 to 20 becquerels per kg seen prior to the Fukushima nuclear crisis at various places in Japan.