Japan's Emperor Akihito (R), flanked by Empress Michiko, delivers an address in front of the altar for the victims of the March 11, 2011 earthquake and tsunami at the national memorial service in Tokyo March 11, 2015. Wednesday marks the fourth anniversary of the devastating March 11, 2011 earthquake which set off a tsunami killing nearly 20,000 and causing meltdowns at the Fukushima Daiichi nuclear plant. REUTERS/Toru Hanai (JAPAN - Tags: ROYALS DISASTER ANNIVERSARY)