Japan foreign minister Yoshimasa Hayashi says recent harassment by local people over Japan's release of treated wastewater from the Fukushima nuclear plant, including incidents of thrown bricks at the Tokyo embassy and harassing phone calls, was "extremely worrying." China banned all seafood imports from its neighbour as Japan began releasing cooling water from the crippled Fukushima plant in an operation that Tokyo and the United Nation's nuclear watchdog have said is safe. SOUNDBITE