Community Security Initiative director Mitch Silber said antisemitic rhetoric online is ‘happening at a much higher run rate than before D.C. and Boulder’

Tom Brenner For The Washington Post via Getty Images
Metropolitan Police Department and Federal Bureau of Investigation officers stand guard at a perimeter near the Capital Jewish Museum on May 22, 2025 in Washington.
The American Jewish community is facing an “elevated threat” following a surge of violent antisemitic attacks across the country in recent weeks, the FBI and Department of Homeland Security warned last week.
In a joint statement, the FBI and DHS called for increased vigilance among Jewish communities, noting the possibility of copycat attacks after a shooting in Washington in which two Israeli Embassy employees were killed and an attack in Boulder, Colo., in which 15 people were injured in a firebombing targeting advocates calling for the release of hostages in Gaza. “The ongoing Israel-HAMAS conflict may motivate other violent extremists and hate crime perpetrators with similar grievances to conduct violence against Jewish and Israeli communities and their supporters. Foreign terrorist organizations also may try to exploit narratives related to the conflict to inspire attacks in the United States,” the agencies warned.
Jewish organizations that track threats to the community are similarly concerned about online rhetoric following the attacks.
The Anti-Defamation League highlighted that, one day after the incident in Boulder, videos allegedly recorded by the assailant shortly before the assault began circulated on a Telegram channel called Taufan al-Ummah, which translates to “Flood of the Ummah,” a reference to the Al-Aqsa Flood, Hamas’ name for its Oct. 7, 2023, terror attack on Israel. The circulated posts celebrated Soliman’s actions.
The ADL also noted that extremists responded to the attack by spreading conspiracy theories which blamed Jews for the firebombing. Additionally, the Bronx Anti-War Coalition posted a threat shortly after the attack: “May all Zionists live in perpetual fear and paranoia until the day the criminal entity crumbles.”
“The volume of alerts when our social media web scraping tools highlight postings that may be real threats is happening at a much higher run rate than before D.C. and Boulder,” Mitch Silber, director of the Community Security Initiative, which coordinates security for Jewish communities in the New York region, told Jewish Insider.
“I would say it’s unprecedented,” Silber said of the threat Jews are confronting.
Silber also called it “unprecedented that American Jews are being targeted because of Israel’s actions,” referring to the Boulder attack, the killing of the two Israeli Embassy staffers, and an attempted arson attack on the home of Pennsylvania Gov. Josh Shapiro during the holiday of Passover. The suspect in the Boulder attack told investigators he “wanted to kill all Zionist people” and had planned the attack for a year. The shooter in Washington yelled “Free Palestine” shortly after the attack and the arsonist cited Shapiro’s support for Israel as his motive.
These attacks, according to Silber, are distinct from other antisemitic incidents that have occurred in recent years, such as the 2018 Tree of Life synagogue shooting in Pittsburgh — which remains the deadliest attack on Jews on U.S. soil — and the 2022 hostage-taking at Congregation Beth Israel in Colleyville, Texas.
“The key element that’s different here is the motivation of the attacks,” Silber said. The Tree of Life shooter was motivated by HIAS immigration actions and the Colleyville shooter was looking to get an al-Qaida fighter freed. “Of course, antisemitism is the broad brush,” he continued, “but if you look at recent attacks, they are really attacks against Jewish communities in the U.S. because American Jews are stand-ins for the Israelis that these attackers can’t reach.”
CSI is responding in “a multitude of different ways,” Silber said. “It’s been a tsunami of requests from organizations.”
“We’re encouraging any Jewish institution or organization to let us know if they are having an event and that way we can let local law enforcement know,” Silber continued, adding that the group’s new plans include subsidizing armed guards to complement law enforcement at outdoor events hosted by Jewish organizations, as well as expanding its team of analysts searching on social media, surface web and dark web for threats.
“We have more hands on keyboards to give ourselves a better chance of detecting a Boulder or D.C. before it happens,” Silber said.
Community Security Service, a group that provides self-defense and safety training to Jewish institutions, also told JI it is beefing up services in light of the recent attacks.
“Both of the attacks within a two-week timespan have been accompanied by the same kind of slogans that we’ve been hearing on college campuses and yelled at synagogues,” said Richard Priem, CEO of CSS. “That is a new manifestation. Of course we are concerned.”
Following Hamas’ Oct. 7, 2023, attack on Israel and ensuing war in Gaza, CSS saw a dramatic increase in Jewish communities requesting security support, which lasted for about a year, according to Priem. “But over the last two weeks, we’ve had dozens of inquiries from organizations,” he said.
“We are making sure that more quarters of the community use the training that we have for them,” Priem said. “Not just by deploying volunteers for large- or small-scale events but also just giving them guidance and training on how to organize themselves in a way that makes them less vulnerable.”
“We will open some community-wide training sessions in the coming weeks that are open to anyone to give awareness to pre-attack indicators,” he continued. “We have to get out of this mindset that the only way we’re going to solve this is by outsourcing to more companies. We’re not going to get out of this situation unless we as a community start taking ownership and realize we have to do training. We have to pay attention. Whether there’s an increased threat or not, people should do preventative training now.”
Marc Calcano, a former NYPD officer who runs a New York City-based private security firm with several high-profile Jewish clients, echoed that “the level of terror” American Jews face is “extremely high right now” and warned that the Boulder attack, in particular, could be easily replicated.
“I instruct individuals and large groups but I think it’s time for us to do this on a larger scale, which is creating an institution where many can come, here in New York and other states to learn how to physically defend yourself,” Calcano said.
The Jewish community can use fear “to its advantage,” he continued. “We have to learn how to protect ourselves.”

Screenshot/X
A man is arrested after throwing a Molotov cocktail at pro-Israel demonstrators in Boulder, CO on June 1, 2025.
Good Wednesday morning.
In today’s Daily Kickoff, we report on the aftermath of the terrorist attack last weekend at a hostage march in Boulder, Colo., and cover a resurgent push for the U.S. to designate the Muslim Brotherhood as a terrorist organization following reports that the Boulder attacker had expressed support for the group. We also talk to students and faculty at Harvard to check in on the school’s recent approach to antisemitism and its clashes with the Trump administration, and report on President Donald Trump‘s recommendation not to increase the funding level of the Nonprofit Security Grant Program. Also in today’s Daily Kickoff: Rep. Randy Fine, Santa Ono and Jake Sullivan.
What We’re Watching
- The White House is holding a briefing for Jewish community leaders this afternoon.
- The House Education and the Workforce Committee is holding a hearing today with Education Secretary Linda McMahon on the department’s policies and priorities.
- Sen. Jim Risch (R-ID) is speaking at the Hudson Institute this afternoon about the future of American foreign policy in the Middle East.
- The Congressional Israel Allies Foundation is hosting a belated Jerusalem Day celebration today on Capitol Hill. MK Gila Gamliel, Israel’s minister of innovation, science and technology, will address the gathering.
- In New York City, WNBC, Politico and Telemundo are hosting a mayoral primary debate at 7 p.m. tonight for nine of the candidates vying for the Democratic nomination later this month.
- Israeli Foreign Minister Gideon Sa’ar is traveling to Germany today, where he’ll meet with his German counterpart, Johann Wadephul, and other senior officials, as well as Jewish communal leaders, in Berlin.
What You Should Know
A QUICK WORD WITH JI’s mELISSA WEISS
The holiday of Shavuot is one of prayer and celebration, marked by all-night learning, indulging in cheesecake and communal events.
But across the U.S., this Shavuot was marked with a fear and unease that has become abnormally normal in recent months, following the Passover arson at the home of Gov. Josh Shapiro and the murders of two Israeli Embassy employees outside the Capital Jewish Museum last month, and deepened further by the horrific attack in Boulder, Colo., on Sunday in which an Egyptian national threw homemade Molotov cocktails at marchers calling for the release of the remaining 58 hostages being held in Gaza. Twelve people, including a Holocaust survivor, were injured.
The reverberations from the attack are already being felt in Washington, where legislators are reviving a bill to designate the Muslim Brotherhood as a terrorist organization. More below.
Two days before the attack, we reported on the Trump administration’s full FY 2026 budget request for Congress — which did not recommend an increase in funding to the Nonprofit Security Grant Program, instead holding it at its current level of $274.5 million. Fewer than half of the requests — which are submitted by organizations at elevated risk of being targeted in a terrorist attack — were fulfilled in 2024.
The attack in Boulder is likely to garner additional calls from the Jewish community for increased funding for the program. In the wake of last month’s deadly attack at the Capital Jewish Museum, a coalition of leading Jewish groups called for the federal government to increase NSGP spending to $1 billion. “The rising level of anti-Jewish incitement, which inevitably leads to violent acts … requires governmental action commensurate with the level of danger,” the organizations said.
In the wake of Sunday’s attack, many legislators condemned the attacks, most denouncing the antisemitic nature of the firebombing. But three Squad members — Reps. Rashida Tlaib (D-MI), Ilhan Omar (D-MN) and Summer Lee (D-PA) — condemned the attacks without mentioning Israel or antisemitism. President Donald Trump, in his response, did not mention Israel or antisemitism either, choosing instead to rail against former President Joe “Biden’s ridiculous Open Border Policy, which has hurt our Country so badly.”
The identities of the victims of the attack and the perpetrators’ declared motivations are political inconveniences to legislators and activists on both sides of the political spectrum — and their decision to erase both perhaps reverberates the loudest.
Other lawmakers focused their comments on the shooter’s immigration status. Mohamed Sabry Soliman had come to the U.S. in 2022 and received a work visa, which expired earlier this year. That the attack was perpetrated by an individual who had been approved for a visa by the Biden administration and remained illegally under the Trump administration is expected to produce more calls for stricter immigration policies. Last night, Homeland Security Secretary Kristi Noem said that Soliman’s wife and five children had been apprehended by immigration officials and faced potential deportation.
But while politicians debate the best approaches — from designating terror groups to calling for immigration crackdowns — Jewish communities remain on edge, feeling unsafe and unheard.
Perhaps nothing underscores Jewish communal concerns at this moment better than an op-ed published in The New York Times on Tuesday by National Council for Jewish Women CEO Sheila Katz.
“When antisemitism emerges within progressive spaces, cloaked in the language of justice, too often it is met with silence and discomfort, creating echo chambers where dangerous ideas are amplified rather than confronted,” Katz wrote. In response to sounding the alarm about antisemitism in left-wing circles, she said, “we have been gaslit, ignored and told that our fear is overblown, our outrage unjustified. Among many groups that have fought to secure and reclaim civil rights, voting rights and reproductive rights, we have seen antisemitism dismissed as not bad enough to matter, our grief met with cynicism, our safety treated as optional.”
Some Americans waking up to their morning news on Tuesday saw “Jews Are Afraid Right Now” as the Times headline accompanying Katz’s piece. But for the first several hours it was posted, the op-ed had a different headline: “American Jews Are Paying for the War in Gaza” — an approach to both the Israel-Hamas war and antisemitism in America that plays into the dual-loyalty tropes that American Jews have fought long before the Oct. 7 attacks.
The Times quietly changed the op-ed’s headline to the milquetoast “Jews Are Afraid Right Now” — which, while correct, missed Katz’s core point: “At rallies and on campuses, in coalition rooms and online spaces, slogans sometimes directly drawn from Hamas’s terrorist manifesto have been chanted and painted on placards, and shouted from stages and in the streets. ‘Globalize the intifada.’ ‘By any means necessary.’ ‘From the river to the sea.’ ‘Zionists out.’ These are not simply words; they can be interpreted as calls for violence.”
The Boulder attacker told investigators he wanted “to kill all Zionist people” — not dissimilar from comments made by the Capital Jewish Museum shooter, who declared, “I did it for Palestine, I did it for Gaza,” after gunning down Yaron Lischinsky and Sarah Milgrim. The arsonist who set the Pennsylvania governor’s mansion on fire said he committed the crime because of what Shapiro, one of the most prominent Jewish politicians in the country, “wants to do to the Palestinian people.”
From academia to activism to journalism, there is a reticence in left-wing circles to acknowledge that inciting language around the Israel-Hamas war can have a dangerous impact.
A year and a half ago, Ivy League administrators were pressed on whether “From the river to the sea” was a genocidal chant. The response, given by the since-ousted presidents of Harvard and the University of Pennsylvania, was that “it depends on the context.”
In this case, the context is the firebombing of elderly Jews calling for the release of hostages in Gaza. Last month, the context was the gunning down of a young couple outside a Jewish organization’s event focused on humanitarian aid in Gaza. In April, the context was the arson of the residence of a Jewish governor on the first night of Passover.
The recent attacks in Harrisburg, Washington and now Boulder are not surprising. They are what happens when ideology-driven activism trumps ethical journalism, when antisemitism becomes a political football and when the boundaries between free speech and calls for violence blur — creating a dangerous and deadly reality for American Jews.
temperature check
Jews at Harvard are still worried about antisemitism — and about Trump’s response to it

As Israeli students departed from Harvard University last month to begin summer break, the usual sense of relief and excitement at having completed another academic year was replaced by fear and uncertainty for many. Amid the Trump administration’s battle with Harvard — which recently escalated to stripping the university of its ability to enroll foreign students entirely — among international students exchanging goodbyes, “See you in the fall” was replaced with “I hope to see you in the fall.” Jewish students and faculty who conduct biomedical research at Harvard also face grim prospects, after Trump revoked billions of dollars in federal funds to the university. At the same time, many Jewish students on campus expressed relief that the antisemitism and anti-Israel activism that was all too common in the aftermath of the Oct. 7, 2023, Hamas attacks had declined significantly in the previous school year, Jewish Insider’s Haley Cohen and Gabby Deutch report.
Trump effect: Changes on campus were implemented at the beginning of the 2024-2025 school year, when Joe Biden was still president, said Harvard Law professor Jesse Fried, noting that Harvard’s progress in addressing antisemitism and students’ anti-Israel bias was not only a result of pressure from President Donald Trump. But once Trump came into office and began threatening Harvard — and then implementing policies that directly targeted the Ivy League university — change happened more quickly, Fried observed. “Harvard is moving very quickly and aggressively to eliminate certain sources of anti-Israel bias on campus,” Fried said. “If the Trump administration were not breathing down their neck, I believe progress would have been much slower.”
Elsewhere: A federal judge dismissed a discrimination lawsuit filed against the University of Pennsylvania by two Jewish students, saying that the plaintiffs failed to demonstrate that the university had taken action that “could be interpreted as antisemitic with the intention of causing harm to the plaintiffs.”