German President Frank-Walter Steinmeier has asked Poland’s forgiveness for Nazi “tyranny”, 80 years on from the start of World War Two.
Mr Steinmeier and other world leaders are in Poland to commemorate the outbreak of the conflict.
Speaking in the capital, Warsaw, Mr Steinmeier apologised for the “horrific war” unleashed by Germany.
“This war was a German crime,” he said in a speech.
His Polish counterpart, Andrzej Duda, and US Vice-President Mike Pence also delivered speeches in front of crowds and heads of state on Pilsudski Square.
Mr Duda denounced Nazi Germany’s attack as “an act of barbarity”, while Mr Pence praised Polish people, saying they “never lost hope”.
Earlier on Sunday, two other commemorative events were held in the cities of Wielun and Gdansk, where the first German attacks of the war happened.