The International Atomic Energy Agency and experts from China, South Korea and Canada on Monday collected seawater samples near the crippled Fukushima nuclear complex in northeastern Japan following the release of treated radioactive water from the site, the Japanese government said. The team is visiting Japan through Oct. 23 to corroborate the country's marine monitoring amid safety concerns over the water release, which began late August. China has sharply reacted to the discharge by imposing a blanket ban on Japanese seafood imports. In addition to seawater, the team will collect samples of seabed sediment and fish and compare the levels of tritium and other radioactive substances from those taken last year, according to Japan's Nuclear Regulation Authority.