WIELUN, Poland (AFP) — German President Frank-Walter Steinmeier on Sunday asked Poland’s forgiveness for history’s bloodiest conflict during a ceremony in the Polish city of Wielun, where the first World War II bombs fell 80 years ago.

“I bow before the victims of the attack on Wielun. I bow before the Polish victims of German tyranny. And I ask your forgiveness,” Steinmeier said in both German and Polish.

Poland suffered some of the worst horrors of World War II: nearly six million Poles died in the conflict that killed more than 50 million people overall.

That figure includes the six million Jews who died in the Holocaust, half of them Polish.

“It was Germans who committed these crimes against humanity in Poland. Anyone calling them things of the past, or claiming that the vile rule of terror of the National Socialists in Europe was a mere footnote of German history, is passing judgement on him or herself,” Steinmeier added in the presence of his Polish counterpart.

The line appeared to be a clear reference to the German far-right, whose co-leader Alexander Gauland once called the 12-year Third Reich a “speck of bird poop” on an otherwise glorious German past.

“As Germany’s Federal President, let me assure you that we will not forget,” Steinmeier said.

“We want to, and we will, remember. And we will bear the responsibility that our history imposes upon us.”

Polish President Andrzej Duda for his part denounced Nazi Germany’s attack on Poland, calling it “an act of barbarity” and “a war crime.”

“I am convinced that this ceremony will go down in the history of Polish-German friendship,” he added, thanking Steinmeier for his presence.

The heads of state will later tour the Wielun museum and meet with local survivors of the 1 September 1939 bombing.

“I saw dead bodies, the wounded… Smoke, noise, explosions. Everything was burning,” Wielun bombing survivor Tadeusz Sierandt, 88, told AFP ahead of the anniversary.

The carpet-bombing came one week after Germany and the Soviet Union secretly agreed to carve up Eastern Europe between them by signing the Molotov-Ribbentrop Pact.

Polish Prime Minister Mateusz Morawiecki and European Commission Vice President Frans Timmermans attended a separate dawn remembrance Sunday in Westerplatte, where a Nazi German battleship opened fire on a Polish fort on 1 September 1939.

Timmermans spoke of how “we Europeans could honor the memory of those who fell for our freedom here.”

“We express it (gratitude) by… working for tolerance, working for mutual respect, working to remove the feeding ground of those who propose intolerance. Who believe that hate is a good engine for politics. Who believe that confrontation between nations, between different cultures, is a good thing,” he said.