The attack came a day after New York City Mayor Bill de Blasio announced that the NYPD was stepping up patrols at several synagogues in the city following a spate of anti-Semitic attacks over the past two weeks.

Three women were allegedly slapped Friday morning by another woman who said she thought they were Jewish, four days after surveillance video showed a 40-year-old man in traditional Jewish clothing being punched in the face.

\"Anti-Semitism is an attack on the values of our city -- and we will confront it head-on,\" de Blasio said in a social media post Friday evening.

Cuomo said the 13 anti-Semitic incidents in New York state have all occurred since Dec. 8.

\"PHOTO:
Rockland Video
PHOTO: Aron Kohn, who was attending an Orthodox Jewish Hanukkah celebration in Monsey, New York, outside New York City, describes how an unknown assailant entered the house and stabbed six people, Dec. 28, 2019.
>

\"This is a national phenomenon that we are seeing and it's frightening, and it's disturbing,\" Cuomo said. \"If anyone thinks something poisonous is not going on in this country then they're in denial, frankly. How many incidents do you have to see from coast to coast.\"

Cuomo has directed police across the state to increase patrols in Orthodox Jewish neighborhoods in light of the recent attacks.

The Monsey attack came just 17 days after two people, a man, and a woman, stormed a Jersey City, New Jersey, kosher supermarket, in an apparent act of domestic terrorism and fatally shooting three people before they were both killed by police. The alleged shooters, David Anderson, 47, and Francine Graham, 50, are also suspected of killing of Jersey City Det. Joseph Seals that same day in a cemetery about a mile from the kosher market, and were prime suspects in the killing of an Uber driver, whose body was discovered on Dec. 7 in the trunk of a car in Bayonne, New Jersey, authorities said.

Both Anderson and Graham are believed to have expressed interest in the Black Israelites, a group that espouses hatred toward Jews and is known for anti-government and anti-police sentiments, sources told ABC News.

\"PHOTO:
WABC
PHOTO: Police respond to a house in the New York City suburb of Monsey, New York, where officials say five Hasidic Jews were stabbed during a Hanukkah celebration, Dec. 28, 2019.
>

Jonathan Greenblatt, chief executive officer of the Anti-Defamation League, expressed outraged over Saturday night's attack.

\"Again, here we are: mourning another act of senseless anti-Semitic violence committed against our community and praying for those who were the victims of this hate,\" Greenblatt said in a statement.

\"When will enough be enough?\" Greenblatt continued. \"These heinous attacks make something abundantly clear: the Jewish community needs greater protection. Whether worshipping in a synagogue, or shopping at a kosher supermarket, or celebrating Hanukkah in the home of your rabbi, Jews should be safe from violence. We are calling for increased protection for the Jewish community now and for those in positions of power and leadership to guarantee that the full force of the law is brought down on those who perpetrate these horrific crimes.\"

The violent attack sent shockwaves all the way to Israel, where Prime Minister Benjamin Netanyahu condemned the attack during an Israeli cabinet meeting on Sunday.

\"Israel unequivocally condemns the recent manifestations of anti-Semitism and the vicious attack in the middle of the Hanukkah holiday at the Rabbi's home in Monsey, New York,\" Netanyahu said. \"We send our wishes of recovery to the wounded. We will cooperate in every way with the local authorities in order to help defeat this phenomenon. We offer our help to each and every state.\"

President Donald Trump called the incident \"horrific\" and wished the victims a \"quick and full recovery.\"

The anti-Semitic attack in Monsey, New York, on the 7th night of Hanukkah last night is horrific. We must all come together to fight, confront, and eradicate the evil scourge of anti-Semitism. Melania and I wish the victims a quick and full recovery.

— Donald J. Trump (@realDonaldTrump) December 29, 2019

Trump's daughter, Ivanka Trump, who is Jewish, also took to Twitter to denounce the attack as \"an act of pure evil.\"

Attacks on Jewish New Yorkers were reported almost every single day this past week.

The increasing frequency of anti-Semitic violence in New York (and around the country) receives far too little local governmental action and national press attention.https://t.co/ZfpJL8Pghc

— Ivanka Trump (@IvankaTrump) December 29, 2019

\"Attacks on Jewish New Yorkers were reported almost every single day this past week,\" Ivanka Trump said in her tweet. \"The increasing frequency of anti-Semitic violence in New York (and around the country) receives far too little local governmental action and national press attention.\"

ABC News' Josh Hoyos and Alexandra Faul contributed to this report.

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