Nagasaki, Japan - The Israeli ambassador to Japan will not be invited to Nagasaki's annual peace ceremony, the city's mayor said Wednesday, adding the decision was taken to avoid unexpected trouble and was not politically motivated.

The city in southern Japan last month invited dozens of countries and territories to the August 9 event on the anniversary of the US nuclear bombing in 1945.

Nagasaki Mayor Shiro Suzuki told reporters the decision was "not politically motivated" but based on a desire to "hold the ceremony in a peaceful and somber atmosphere."

The city had been holding off inviting Ambassador Gilad Cohen due to the "potential risk of contingencies" arising from "various developments worldwide around the present Middle East situation."

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Concerns over that risk still persist, Suzuki said, describing Cohen's exclusion as a "very tough decision."

Last month, Suzuki said Nagasaki had sent a letter to the Israeli embassy calling for an "immediate ceasefire."

The ambassador, for his part, called Wednesday's decision "regrettable" and claimed it "sends a wrong message to the world."

"As a close friend and like-minded nation of Japan, Israel has attended this ceremony for many years to honor the victims and their families," he wrote on social media platform X.

Israel has carried out unrelenting military attacks in Gaza since last October, creating conditions of starvation and disease and sparking widespread accusations of genocide.

More than 39,400 Palestinians have been killed in the Gaza Strip since that time, according to data provided by the territory's health ministry.

Hiroshima has invited Israel to its ceremony but in its letter called for a "ceasefire as soon as possible and resolution through dialogue," a city official said.

Around 140,000 people died in Hiroshima and 74,000 in Nagasaki when the US dropped atomic bombs on the cities in August 1945 near the end of World War II.