Crews from more than 50 helicopters in Japan are among nearly 6,000 rescuers aiding victims of floods brought on by Typhoon Etau. The rescue helicopters included the Japan Self-Defense Forces and civil agencies. Etau made landfall Sept. 10 near Nagoya, more than 150 mi southwest of Tokyo, but the worst flooding was reported in the Ibaraki and Tochigi prefectures north of that capital. Some reports said one day’s rain in parts of Tochigi more than doubled the prefecture’s average for September. Flooding was aggravated when the Kinugawa River burst its banks in Ibaraki’s Joso city. The typhoon also swamped the disabled Fukushima Daiichi nuclear power plant, flushing hundreds of tons of radioactive water into the ocean, the operator of Tokyo Electric Power Co. said. The plant was severely damaged in a 2011 earthquake and tsunami and has since been shut down.