The Polish president attended a memorial cermony in the western Ukrainian city of Lutsk to mark the 70th anniversary of a notorious massacre during World War II when more than 100,000 people were killed.
The massacres took place in 1943 and 1944 in Volyn, which was then part of Poland, when nationalists on both sides killed tens of thousands of civilians.
Historians estimate that 60,000 to 80,000 Poles were killed by Ukrainian nationalists in the ethnic conflict. The nationalist Ukrainian Insurgent Army (UPA) carried out the massacre. The army was anti-Soviet and pushing for Ukrainian independence. Before the war the predominantly Ukrainian-populated area was under a Polish rule.
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