The operator of Japan's damaged Fukushima Daichii nuclear power plant [Tepco] says it has stopped the leak of highly radioactive water into the sea. Problems at the plant are far from over, however, as the reactors still need to be kept from overheating. While Japan's crown prince and princess have paid a visit to those displaced by the massive earthquake and tsunami that struck the country, Naoto Kan, the prime minister, continues to come under increasing pressure to do more for evacuees.