The New York City Police Department said these possible hate crimes happened between Dec. 13 and Wednesday, with most taking place during the Hanukkah holiday.
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In one instance, a mother was hit in the head while walking with her three-year-old son in Brooklyn. The attacker made anti-Semitic comments and vowed that "your end is coming to you."
Police also said a suspect entered the Chabad Lubavitch World Headquarters in Crown Heights, Brooklyn, approached a member of the Hasidic community, and threatened to shoot people.
In the most recent attack, a man wearing traditional Orthodox Jewish attire was walking in the Borough Park neighborhood of Brooklyn when a man punched him in the face. This attack has not yet been labeled a hate crime.
In light of these attacks, New York City Mayor Bill de Blasio announced that the NYPD will increase its presence in Borough Park, Crown Heights and Williamsburg -- neighborhoods with large Orthodox Jewish populations.
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"Anti-Semitism is an attack on the values of our city - and we will confront it head-on," he tweeted.
The attacks have happened as Jewish communities in the New York City metro area were already on edge after a deadly Dec. 10 shooting rampage at a northern New Jersey kosher market. New Jersey Attorney General Gurbir Grewal said the attack was driven by hatred of Jews and law enforcement.
Our sister station WABC-TV and the Associated Press contributed to this report.