ZAGREB - Croatian Jews said on Monday they would boycott the country's main Holocaust remembrance event this week, accusing the authorities of playing down crimes perpetrated under the Nazi-backed Ustasa regime during World War Two.International Holocaust Remembrance Day is held on Jan. 27 each year, the date in 1945 when the biggest Nazi concentration camp, Auschwitz in occupied Poland, was liberated by Soviet troops.Three months ago, rightist veterans of Croatia's 1991-95 independence war raised a commemorative plaque in the town of Jasenovac to comrades killed there at the beginning of the conflict Zagreb fought to secede from Serbian-led Yugoslavia.Included in the veterans' plaque are words from a salute used by the Ustasha regime that killed tens of thousands of prisoners including Jews, Serbs, Roma gypsies and anti-fascist Croats, in the 1941-1945 Jasenovac concentration camp.