The ongoing menace of antisemitism was tragically highlighted on Thursday when two individuals were killed during an attack on a U.K. synagogue. This assault occurred while Jews worldwide were observing Yom Kippur, their holiest annual event, amid ongoing international attempts to liberate 46 Israeli captives seized by Hamas.

Details about the attacker, who targeted the Heaton Park Hebrew Congregation in the northeast English city of Manchester by driving a vehicle into pedestrians and stabbing at least one person, have not yet been disclosed.

British police shot and killed the suspect, and authorities declared the attack a terrorist incident.

“Regrettably, incidents like today’s in the U.K. are becoming commonplace,” Jonathan Ruhe, Director of Foreign Policy at the Jewish Institute for National Security of America, expressed to Fox News Digital.

Israeli Prime Minister Benjamin Netanyahu reached out on X to extend his sympathy to the attack’s victims and conveyed, “Israel mourns with the UK Jewish community following the brutal terror assault in Manchester.

“As I warned at the UN: weakness in the face of terrorism only brings more terrorism. Only strength and unity can defeat it,” he added. 

With the motive behind Thursday’s attack still unclear, Ruhe contended that the reluctance of European leaders to apply “their influence to endorse a sustainable post-Hamas future for Gazans” while instead “criticizing” Israel has fostered increased antisemitic attitudes. 

The attack on the Manchester synagogue comes just two weeks after the U.K. and other European leaders agreed to recognize a Palestinian state after long refusing to do so. 

But anti-Semitism is also on the rise in the U.S., which Ruhe noted is possibly even more concerning given Europe’s history with combating the issue.

Jewish-targeted attacks in the U.K. rose 282% over the last decade, according to data collected by the CST. But in the U.S., antisemitic attacks jumped by 893% in the same 10-year period, according to the Anti-Defamation League, with some 9,354 incidents reported last year. 

“The rise of open and violent anti-Semitism in America is more recent than in much of Europe, but perhaps all the more worrying because of that,” Ruhe said. “Part of the solution is colleges shutting down far-left campus ‘protests’ that intend only to intimidate Jews and anyone who calls for policies short of ending Israel’s existence. 

“It’s been very telling that such ‘protesters’ use militarized language like ‘encampments’ to describe their campus presence and activities.” 

Former President Donald Trump walks on stage at a fighting antisemitism event with Miriam Adelson at Trump National Golf Club Bedminster Aug. 15, 2024, in Bedminster, N.J. (Adam Gray/Getty Images)

But Ruhe pointed out that anti-Semitism is an increasing concern across the political spectrum’s extremes, driving a narrative on both the far left and far right.

“There’s also a somewhat subtler normalization of antisemitism on the far right, for example, major influencers asking whether we need more context in talking about Adolf Hitler and Nazism,” Ruhe said. “There needs to be more serious and clear pushback from our political leaders on narratives like these.”