shinzo abe
The blast, on the 68th anniversary of North Korea’s founding, was more powerful than the bomb dropped on Hiroshima, according to some estimates.
Tokyo will host the Summer Games in 2020.
Prime Minister Abe controversially wants to revise the country's pacifist constitution.
"Amongst those nations like my own that own nuclear stockpiles, we must have the courage to escape the logic of fear and pursue a world without them," he said.
WHAT'S HAPPENING
Perhaps the most painful disagreement between the two countries has been over the “comfort women” issue.
The deal included an apology from Japanese Prime Minister Shinzo Abe and an $8.3 million aid fund from Tokyo for the elderly former sex slaves.
No one was injured by the explosion at the controverial Yasukuni shrine.
These new policies would be a stark shift from the nation's pacifistic constitution.
"History is harsh," he said.
Will the prime minister apologize for Japan's wartime legacy?