The editor of a Jewish publication in the United Kingdom (UK) said that the substantial and ongoing trend of Jews leaving France for other countries will only increase in the wake of Paris’ latest anti-Semitic attack. Stephen Pollard, the editor of UK’s The Jewish Chronicle, reported on Twitter that, in the aftermath of Friday’s Islamic attack, every Jew he knows “has either left or is actively working out how to leave” France.

Jews have been leaving the country in record numbers as anti-Jewish attacks have escalated. In 2013, the Council of French Jewish Institutions recorded 423 anti-Semitic incidents in France. In 2014, several episodes in Paris saw rampaging youth firebombing synagogues, attacking businesses, and chanting “Death to Jews.”

Since World War II, France has been home to the largest population of Jews in the European Union. However, in the last year and a half, the Jewish population has decreased approximately 20 percent, from 500,000 to 400,000.

The latest terrorist attack (and resulting deaths) at a kosher grocery store in Paris has been widely reported and Pollard predicted that even greater numbers of Jews will now flee France. He said that any anti-Jewish problems his own nation might experience are put “in perspective” by the “outrages that have been getting worse for years” in France. In fact, he repeated statistics showing that the ongoing flight of Jews from France “is the largest emigration of Jews anywhere” since World War II. “That,” he said, “is a simple fact.”

The 32-year-old hostage-taker, Amedy Coulibady, was killed when police rushed the Hyper Cacher supermarket he was holed up in in the Porte de Vincennes area of Paris’ 12th arrondissement. Media reports say that four of his 20 hostages were killed and five wounded. Coulibady is also believed responsible for the death of a Paris policewoman the day before. Attempts by police to pre-empt further violence were made later in Paris’ ancient Jewish quarter, the Rue des Rosiers, when retailers were ordered to close early.

According to Community Security Trust, a British charity working to ensure the safety of the UK’s 260,000 Jews, police have also stepped up security in that country. The organization said police were increasing patrols at Jewish temples and other venues in areas of London and Manchester .

According to Natan Sharansky, an Israeli politician and human rights activist, 50,000 French Jews inquired with The Jewish Agency for Israel about immigrating to that country in 2014. That Agency is currently hosting two information seminars a day in France while, one year ago, it was hosting one per month.

Another terrorist recent attack in Paris, at the offices of the Charlie Hebdo newspaper, resulted in the death of 12 more people. The suspects, Cherif and Said Kouachi, were arrested at a print shop in an area north of Paris.

A vigil outside Hyper Cacher Saturday night saw several thousand people holding space for those who died the day before. French President Francois Hollande stated that his country remains under threat and “unity” is the best weapon against future attacks. Friday’s assault, he said “was a terrifying anti-Semitic act.”