Like Carl said, Muslims and Jews have been at war for hundreds of years. And, contrary to popular belief, Muslims aren't always the aggressors.
Can you blame the Jews for being agressors every once in a while, wouldn't you want to mount an offensive against a people that was trying to iradicate you??? Anyway, the Coran makes it quite clear that Muslims are to kill all Jews. Seems to me that was a "holy" book long before Hitler came to power.