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Graffiti was painted on the exterior of a historic yeshiva on Manhattan’s Lower East Side, JTA reported on Monday.

The Mesivta Tiferes Yerushalayim building was vandalized between Friday afternoon and Saturday evening, possibly while students were inside, according to the report.

The graffiti included what looks like a clown face, the word “evil,” and a series of letters and numbers meant to look like a racial slur, police told the local media.

The New York Police Department’s Hate Crimes Unit is investigating the graffiti as a “possible bias incident,” Mayor Bill de Blasio said in a tweet.

Police are looking at security camera footage, according to the Yeshiva World News website, which first reported the incident.

Mesivta Tiferes Yerushalayim is among the oldest existent yeshivas in the city and is renowned for being the institution once led by the late Rabbi Moshe Feinstein, who is regarded as one of the most important Jewish legal authorities. The rabbi’s son, Rabbi Dovid Feinstein, now leads the yeshiva.

Earlier this month, dozens of anti-Semitic fliers were found in Queens, in another incident being investigated by the NYPD Hate Crimes Unit.

Also this month, footage of an anti-Semitic couple in the Catskills went viral, after the two launched into an expletive-laden anti-Jewish rant against a Jewish driver.