US Jews on Monday marked the one-year anniversary of the firebombing attack in Boulder, Colorado, in which an anti-Zionist attacker hurled gasoline bombs at a rally for Israeli hostages, killing an elderly woman and wounding more than a dozen.

“Karen Sorin Diamond, an 82-year-old mother and grandmother, did not survive,” Susan Rona, the Mountain States regional director of the Anti-Defamation League, said in a column mourning the attack. “I have spent the past year carrying that and thinking about that. I think many of us have.”

The attack came weeks after the murder of two Israeli Embassy staffers in Washington, DC.

They were among 20 Diaspora Jews murdered in 2025, the most deadly year for Diaspora Jewry in decades.

While the killings in Washington and Colorado were an earthquake for the US Jewish community, most Americans are unaware of the deaths and other incidents of violence against Jews, according to data shared with The Times of Israel.

The Blue Square Alliance Against Hate, a US nonprofit that monitors and fights antisemitism, polled Americans on violent antisemitic attacks late last year. The data have not been previously reported.

Denver, CO – One year ago, an act of antisemitic terror in Boulder forever changed Colorado’s Jewish Community. As we mark the anniversary of the June 1 attack, we remember Karen Diamond, z”l, whose life was taken as a result of her injuries. @jfederations @boulderjcc pic.twitter.com/qjhrWlxK7o Advertisement if(typeof rgb_remove_toi_dfp_banner != "function" || !rgb_remove_toi_dfp_banner("#Article_Incontent1")){ window.tude = window.tude || { cmd: [] }; tude.cmd.push(function() { if(navigator.userAgent.indexOf("rgbmedia-app") > -1){ tude.setDeviceType("mobile"); } tude.refreshAdsViaDivMappings([ { divId: 'Article_Incontent1', baseDivId: 'Article_Incontent1', } ]); }); } — JEWISHcolorado (@JEWISHco) June 1, 2026

Denver, CO – One year ago, an act of antisemitic terror........

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