Mayor Eric Adams condemned antisemitism and other forms of hate at a news conference on Monday, three days after law enforcement officials derailed an alleged plot by two men to attack a synagogue and harm Jewish people in Manhattan.

Surrounded by NYPD top brass and leaders from the Jewish community at City Hall, Adams said his administration was in “complete coordination” with Gov. Kathy Hochul following Friday’s arrests.

“This was not an idle threat,” Adams said. “Over 77 years ago after Allied forces liberated Auschwitz and exposed the full extent of the horrors of the Holocaust, hate is on the rise in America, a dark cloud over our nation.”

“It has become normalized by politicians and celebrities, amplified by social media and cable news and weaponized by the easy availability of guns in this country,” he added. 

Prosecutors said Christopher Brown, 21, of Long Island, and Matthew Mahrer, 22, of Manhattan, were armed with an illegal Glock semiautomatic firearm, a high-capacity magazine, ammunition, a military-style knife, a swastika arm patch, ski mask and a bullet proof vest when they were taken into custody at Penn Station on Friday.

Their arrests came after a joint investigation by a bevy of law enforcement agencies found that Brown had been making threats against the Jewish community on Twitter, according to prosecutors.

By Sunday morning, Brown had been charged with making a terroristic threat, aggravated harassment and criminal possession of a weapon. Mahrer was charged with criminal possession of a weapon, prosecutors said.

With Hanukkah on the horizon, Adams on Monday said local law enforcement officials would redouble their commitment to ensuring the Jewish community would be able to celebrate the holiday safely.

“Hatred and antisemitism will not take a foothold in New York City,” Adams said. “No one should feel threatened walking down the street or traveling on the subway. No one should ever feel threatened walking into their synagogue or place of worship.”

“We are going to fight the rise of antisemitism and extremism and continue to support our law enforcement communities,” he added.

Shortly after Friday’s arrests, NYPD Commissioner Keechant Sewell said officers would be deployed at “sensitive locations” throughout the city.

Hochul on Sunday, meanwhile, tweeted that she had directed New York state police to “increase support for communities that are potential targets of hate crimes,” including the Jewish and LGBTQ communities.

Over the weekend, a 22-year-old gunman opened fire inside a gay nightclub in Colorado Springs in Colorado, killing five people and leaving at least 25 others injured.

And earlier this month, a man was arrested and charged with making an online threat against synagogues in New Jersey.

NYPD officials at Monday’s news conference said they did not believe there was any ongoing threat to New York City’s Jewish community.

Adams, asked about the role social media plays in radicalizing people, said it “must become more responsible in the spreading of hate and organizing, and allowing their platforms to be used as an organizing tool.”

“We saw what happened in Buffalo,” he said, referring to the mass shooting at a Tops supermarket in Buffalo in May that left 10 people dead and three others injured. All of the victims were Black.

“The individual involved was radicalized not by his parents, not by his family, they were radicalized by this new community that is really given life through social media,” he added.