Police are investigating an anti-Semitic message found at the Jewish Children’s Museum in Brooklyn.

CNN reports New York City police were alerted after a post-it note with the words “Hitler is coming” was found on a billboard display in front of the museum Thursday.

Police told the news outlet they are trying to determine whether the note should be investigated as a hate crime. They said they do not have any suspects.

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CNN notes, according to the New York City Police Department, that hate crimes in the city have gone up 67 percent from April 2018 to April 2019.

New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE (D) Gov. Andrew Cuomo (D) both publicly condemned the anti-Semitic message found at the museum.

"It's part of a very troubling pattern that we're seeing,” Cuomo said Friday. “Increased anti-Semitic attacks all across this country and all across this state.”

De Blasio wrote in a post on Twitter that it is part of a "wave of hatred has been allowed to fester in our society."

The same museum was evacuated in 2017 after receiving a bomb threat.

Co-founder and director of external affairs Devorah Halberstam told CNN the post-it note was found on a message board where young children typically write “acts of goodness and kindness.”

She also noted the previous threats and anti-Semitic hate the museum has previously been subject to.