WARSAW: 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 Germany in World War II. The country’s 3.2 million Jewish population was the largest in Europe at the start of the war. Historical disputes over World War II and the Holocaust have strained relations between Poland and Israel in the past. Studies have spoken of complicity by some Poles in the killing of Jews,...