The mayors of Hiroshima and Nagasaki will call on the government to help realize a treaty banning nuclear weapons at upcoming anniversaries marking the 1945 U.S. atomic bombings in their cities.

This year's declarations follow the adoption in New York last month by 122 U.N. members of the Treaty on the Prohibition of Nuclear Weapons. As a country under the U.S. nuclear umbrella, Japan did not participate, nor did any of the nuclear weapon states.

Hiroshima Mayor Kazumi Matsui announced an outline of his declaration at a news conference on Tuesday, to be read out at a commemoration ceremony on the anniversary of the bombing on Aug. 6.