The severed head of a pig was hung in the entrance of a synagogue on Friday in the central Israeli city of Ramat Hasharon, Israel Police said.
Israel Police are at the scene, and have opened an investigation into the incident.
Israeli figures on both sides of the political spectrum condemned the act on Twitter.
Education Minister Naftali Bennett responded: "The hanging of a pig's head in the entrance of the synagogue in Ramat Hasharon is a horrible criminal act."
Bennet blamed the "imagined" belief that there is a campaign to increase the influence of religion in Israel, which causes certain individuals to hate Judaism as a whole.
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He continued to say, "This event does not represent the secular population of our nation, not even its edges. All of us, secular and religious together, will continue to love our traditions. We are proud of our nation and our heritage."
Interior Minister Arye Dery tweeted, "I was shaken to the depths of my soul by the hate crime committed this morning in Ramat Hasharon… If such an abominable act had been committed in a foreign country we would all be up in arms. We must investigate immediately, arrest those responsible and bring them to justice!"
The director of the New Israel Fund, Mickey Gitzin, called the event "an ugly and shameful act," adding that "historically a pig's head on a synagogue has been a symbol of Anti-Jewish violence. We must sharply oppose such actions, as we must oppose all violence based on religion, politics, sexuality, nationality or any other reason."
MK Merav Michaeli (Zionist Union) said, "There are not enough words to condemn the hideous act committed at the synagogue in Ramat Hasharon. it is a punch in the gut for all those who believe in democracy, and the respect for people and their choices. It is shameful."