U.N. Secretary General Antonio Guterres will travel to Nagasaki to attend the annual ceremony marking the atomic bombing of the city, the United Nations said Tuesday.

It will be the first time for a U.N. secretary-general to attend the Aug. 9 anniversary. In 2010, Guterres' predecessor, Ban Ki-moon, became the first U.N. chief to attend the event commemorating the Hiroshima atomic bombing.

Nagasaki was the second city to be targeted in 1945, only three days after Hiroshima. The atomic bombings took place late in World War II and heralded the start of the nuclear age.