Israelis observed two minutes of silence Thursday as sirens wailed in remembrance of the 6 million Jews killed in the Holocaust.
The 10 am (0700 GMT) sirens marked the start of a state wreath-laying service at the Yad Vashem Holocaust Memorial Centre in Jerusalem during Israel's annual Holocaust Memorial Day, which began after sunset Wednesday and lasts until sunset Thursday.
Ceremonies were also held at schools, colleges and universities throughout the country.
Prime Minister Benjamin Netanyahu, at an opening ceremony at Yad Vashem, charged that the world had not learned from World War II and was treating Iran's "aggression" in the Middle East with the same "appeasement" after failing to recognize the threat of Nazi Germany.
In Poland, thousands of Jewish youths from around the world are set to participate in the annual March of the Living - a three-kilometre march from Auschwitz to Birkenau, the two sections of the largest Nazi extermination camp complex.
Although the United Nations has designated January 27 as international Holocaust Remembrance Day, Israel traditionally marks it on the 27th day of the Jewish month of Nissan, one week before Independence Day to symbolize the rise of the state of Israel from the ashes of the Holocaust.
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