Anti-nuclear protesters gathered outside the headquarters of Tokyo Electric Power Company (TEPCO) in the country's capital on Sunday, as it marks the first anniversary of the March 11 earthquake and tsunami.
Protestors claim that TEPCO's negligence was responsible for the leakage of radiation from the plant that led to the worst nuclear crisis since the 1986 Chernobyl disaster.
A year after the biggest earthquake to hit Japan the country remembers the events of that terrible day.
Experts disagree about how long it will take to clean up after Fukushima - it could easily be decades. But why did it happen at all?