Prosecutors are not likely to press criminal charges against former TEPCO executives and others, including a former prime minister, for their handling of the 2011 nuclear crisis at the Fukushima Daiichi plant.
Fukushima residents had filed criminal complaints against Tokyo Electric Power Companys former executives and government officials.
They include former TEPCO chairman Tsunehisa Katsumata and former Prime Minister Naoto Kan.
More than 40 people have been indicted.
Over the past year, prosecutors have been investigating whether these officials and executives were able to predict such a massive earthquake and tsunami in advance.
The prosecutors not only questioned those who were indicted, but also asked for the opinions of experts on quakes and tsunami.
They concluded that these people cannot be held responsible because they were not able to predict the real dangers of such a massive quake and tsunami.