Now, leaders and communities and promising action.
"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," Anti-Defamation League CEO Jonathan Greenblatt said in a statement Sunday following the attack a day earlier in Monsey. "This is at least the 10th anti-Semitic incident to hit the New York/New Jersey area in just the last week. When will enough be enough? These heinous attacks make something abundantly clear: The Jewish community needs greater protection."
Both Governor Andrew Cuomo and New York City Mayor Bill de Blasio both took the radio airwaves Monday morning to address the issue, and Cuomo has directed state police to step up patrols in Jewish neighborhoods across the state.
Throughout the region, a collective voice is being heard that violence and anti-Semitism will not be tolerated. At the menorah lighting in Grand Army Plaza Sunday night, people of many faiths joined in solidarity against hate.
The mayor announced he was ramping up plans to increase protections in and around several Jewish neighborhoods in Brooklyn that have seen upticks in anti-Semitic incidents, providing additional police patrols, more light towers, and more security cameras. Galvanized neighborhood safety coalitions are on higher alert.
"We have to give people a sense of security, and we have to show that this horrible trend we've seen over the last weeks will be stopped dead in its tracks," de Blasio said.
Rockland County officials announced they will be turning to a private security firm to help secure synagogues throughout the county, and that the firm involved is donating their efforts.
"The fact of the matter is we cannot sit around and do nothing, so we are taking proactive action," county Executive Ed Day said.
For the next several months, armed private security from Brosnan Risk Security will be station outside of shuls throughout the county, working alongside law enforcement at synagogues where they've been requested.
WATCH: Rockland County announces security upgrades following Hanukkah attack
Since the Dec. 10 massacre at a kosher grocery store in New Jersey, there have been at least 19 anti-Semitic incidents in the U.S., including 16 in New York and New Jersey, according to the ADL's Tracker of Anti-Semitic Incidents. The tracker is a compilation of recent cases of anti-Jewish vandalism, harassment and assault reported to or detected by the group.
Most concerning is that 10 of those incidents have occurred in New York since Dec. 23 and involved assaults or threatened violence. The ADL defines assaults as incidents where people's bodies are targeted with violence accompanied by evidence of anti-Semitic animus or in a manner that attacks Jews for their religious affiliation.
To put the week-long toll in context, the NYPD recorded 19 hate-crime felony assault complaints in the first three quarters of 2019.
The surge of high-profile attacks on the Jewish community, including shooting rampages at the Tree of Life synagogue in Pittsburgh in October 2018 and at a synagogue in Poway, California, in April, have caused consternation around the country.
The main entrance to the B'nai Jacob synagogue in Middletown, Pennsylvania, remained locked on Sunday while congregants celebrated Hanukkah and held a minute of silence for the victims at Monsey's Netzach Yisroel synagogue.
The Middletown congregation will be installing new security cameras Monday, said the synagogue's caretaker, Horris Toser. They also plan to implement other state police recommendations to make the facility more secure.
"So far, they've only shot our windows with BB guns, but you never know these days," Toser said. "I've never heard of so many anti-Semitic attacks as I hear about these days. My parents talked a lot about it during the (World War II) war. It's very sad."
Ed Beck, the synagogue's vice president, wants to organize a million-person march against anti-Semitism and stage it around the globe. "It's scary. Identifiable Jews are no longer safe in many places," he said.
Saul Strosberg, a senior rabbi at Congregation Sherith Israel in Nashville, Tennessee, said his community is security focused as well and careful about keeping doors locked and monitoring the perimeters around the building.
"We're extremely vigilant about all sorts of unusual behavior now," he said.
He added that he's seen a trend of fewer schedules being posted on synagogue websites and armed guards stationed at entrances.
"It's just one of the realities of being Jewish," he said.
Ofir Dayan, 25, president of Students Supporting Israel at New York's Columbia University, said the concern is strong among college students, adding that she has been harassed.
"The demonization of Jews and Israel on college campuses and social media doesn't stop there. It is being received and propagated in the real world and causes anti-Semitic extremists to take the life of innocent people, just because they are Jewish," she told The Associated Press.
Dayan called on leaders at every level, from college campuses to the federal government, to speak out against the acts.
The Congressional Caucus on Black-Jewish Relations condemned the Monsey attack "in the strongest possible terms" and said the surge in anti-Semitic attacks is a "disturbing trend both here in the United States and abroad." The National Action Network founded by Rev. Al Sharpton is planning a news conference Monday with black religious and civil rights leaders and Jewish allies to denounce anti-Semitism.
The Simon Wiesenthal Center issued a statement urging President Donald Trump to instruct the FBI to create a special task force to address the violence. Concern over the attacks prompted Gov. Andrew Cuomo to direct the New York State Police to patrol Orthodox Jewish neighborhoods across the state.
Still, noted Mark S. Bloom, rabbi at Temple Beth Abraham in Oakland, California: "You can't up security every time an incident happens because they happen so often."
Senior Rabbi Marcia Zimmerman of Temple Israel in Minneapolis, Minnesota's largest Jewish congregation, said Hanukkah is about Jews fighting for their faith and perhaps the antidote is to "make sure we all have an understanding of each other."
Evan R. Bernstein, the regional director of the Anti-Defamation League of New York and New Jersey, said while there are no studies to fully explain why the incidents are occurring, he believes part of the issue is changing neighborhood demographics and stereotypes about Jews. He said there is a lack of understanding of who the Hasidic groups are as they expand in communities in the region.
The reform and conservative Jews of past decades seemed more socially integrated into the neighborhoods while the more Orthodox groups are more insular, he said.
"t's not because they don't like anybody. They function different," Bernstein said. "They just want to practice their religion in American society but they aren't as overtly social as other Jewish groups were. That's not a reason for a group to be marginalized, assaulted or attacked on social media. They have every reason to practice their religion the way they want to practice. They shouldn't have to change."
The ADL is working on several initiatives to change the perceptions and misconceptions. One is its "No Place for Hate" anti-bias, anti-bullying initiative, which works in schools. Another includes working with juvenile offenders who are involved in some of the incidents to understand what they did and why.
"We need to get better facts," Bernstein said.
Rabbi Daniel Greyber of Beth El Synagogue in Durham, North Carolina, said he would keep lighting his family's menorah out on the front porch on Sunday as a sign of solidarity with the Monsey congregation and Jews worldwide.
"When an Orthodox community in New York is under attack there is a feeling that Jews everywhere are under attack," he said. ""I never want somebody in my community to be afraid for being Jewish."
(The Associated Press contributed to this report)
* Follow us on YouTube
* More local news
* Send us a news tip
* Download the abc7NY app for breaking news alerts