Japan marks the 10th anniversary of the earthquake and tsunami that left more than 18,000 people dead and set off a nuclear crisis with a national memorial attended by Prime Minister Yoshihide Suga and Emperor Naruhito, who will both deliver a speech. 

On March 11, 2011, a magnitude-9.0 earthquake and subsequent tsunami devastated large swaths of Japan's northern coast and triggered a meltdown at a nuclear power plant in Fukushima, contaminating large areas and dislocating many residents.