The Japanese government reports that trace amounts of radioactive iodine were detected in tap water in Tokyo and five other areas, amid concerns about leaks from a damaged nuclear power plant.

A government ministry reported Saturday that small amounts of the iodine was found in tap water in Tokyo and five other prefectures. The ministry says the amounts did not exceed government safety limits but usual tests show no iodine.

But the findings add to public concerns about radiation leaking from the Fukushima nuclear power plant crippled by the earthquake and tsunami.