NEW YORK (Kyodo) U.N. Secretary General Ban Ki Moon on Monday urged leaders set to gather at a conference in Hiroshima to "intensify efforts" toward nuclear abolishment, his spokesman said.

"The secretary general stresses the need to work together toward the day when governments no longer have a choice but to respond to the will of the people for a nuclear-free world," Martin Nesirky said of Ban's message to the Hiroshima Conference for the Total Abolition of Nuclear Weapons by 2020, to be held from Tuesday to Thursday.

In the message, the U.N. chief also urges world leaders, particularly those of the nuclear weapon states, to "visit Hiroshima and Nagasaki, to see firsthand the drastic reality caused by nuclear war."