The concentration of radioactive iodine in seawater near Japan's crippled Fukushima Daiichi Nuclear Power Plant is 3,355 times above the norm, the Kyodo news agency reported on Wednesday.
The figure has more than doubled since Monday, when levels of radioactive iodine in the sea near reactors 5 and 6 were 1,150 times higher than normal.
Radiation leaks were reported at plant after a powerful earthquake and tsunami struck eastern Japan on March 11, killing more than 11,000 people.
The Russian emergencies ministry said in a report released on Wednesday that radiation levels in Russia's Far East were within the norm, despite media reports that low levels of radioactive iodine was detected in the Primorye Region.
MOSCOW, March 30 (RIA Novosti)