WARSAW (Reuters) -Israeli soccer fans held up a banner reading “Murderers since 1939” during a match against a Polish team on Thursday, causing outrage in Poland as the president said it insulted the memory of Poles, including Jews, killed in World War Two.

Poland was occupied by Nazi Germany in World War Two. The country’s 3.2 million Jewish population was the largest in Europe at the start of the war. Almost all were killed, many of them in Nazi German death camps, and a further 3 million non-Jewish citizens also died during the occupation.

Historical disputes over World War Two and the Holocaust have strained relations between Poland and Israel in the past.

Studies have shown complicity by some Poles in the killing of Jews by Nazi Germany, but many Poles reject such findings, saying

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