NAGASAKI, Japan, Aug. 9 (Xinhua) -- Japan's city of Nagasaki on Friday marked the 74th anniversary of the atomic bombing in World War II, with Nagasaki mayor calling for the Japanese government's efforts in upholding the spirit of "never resort to war" during the memorial ceremony.

About 5,200 people and representatives from around 70 countries and regions attended the annual memorial ceremony held at the Peace Park.

Tomihisa Taue, the city's mayor, called on the government to adhere to the spirit of "never resort to war" and spread the spirit around the world.

"Above all, I ask the Japanese government to uphold the spirit of 'never resort to war' enshrined in the Japanese Constitution and to take the lead in disseminating that spirit around the world," Taue said.

He also urged the central government to immediately sign a U.N. treaty banning nuclear weapons, the third time he conveyed the same message in three years.

"As the only country in the world to have experienced the devastation caused by nuclear weapons, Japan must sign and ratify the Treaty on the Prohibition of Nuclear Weapons as soon as possible," Taue said in the Nagasaki Peace Declaration.

Japanese Prime Minister Shinzo Abe pledged in his speech that Japan would continue its efforts to serve as a "bridge between nuclear weapon states and non-nuclear weapon states."

"As the only country to have experienced nuclear devastation in war, Japan will tirelessly continue its efforts to achieve a world free of nuclear weapons," he said, adding that "this mission remains unchanged even in the Reiwa era."

A message from UN Secretary General Antonio Guterres was conveyed in the ceremony. "The only true guarantee against the use of nuclear weapons is their total elimination," he said.

Nagasaki was hit by an atomic bomb on Aug. 9, 1945, which prompted Japan's surrender and the end of World War II, making it the second city to have endured atomic bombing after Japan's Hiroshima was hit on Aug. 6 the same year.

While Japan inwardly looks at the tragedies it had experienced at the end of World War II, historians and political minds of the international community have encouraged Japan to come to see themselves not as merely victims of the atomic bombings but also as the perpetrators who led to these tragic incidents to happen in the first place.

Japan brutally occupied many parts of Asia before and during World War II, causing untold suffering and deaths to hundreds of thousands of innocent victims.