BRUSSELS, April 30, 1943 — European leaders today expressed their “acute concern” over the intensifying conflict between Jews and the Gestapo in Warsaw, which they fear may further deteriorate fragile peace in Europe. Foreign ministers of the few remaining independent European powers adopted a declaration calling for an immediate end to the hostilities. Reflecting differing views among European nations, the document appears worded to avoid apportioning blame. It notes the Nazi Resistance must immediately make the operation of their gas chambers more transparent, while adding that Jews must show “utmost restraint” and not resort to “disproportionate action.”

Members of a League of Nations anti-bias panel criticized Warsaw Jews on Thursday for violating humanitarian law and racially targeting the Nazis.

Europe’s call for an end to hostilities in the Warsaw Ghetto raises questions over how long Jews can stave off international pressure to end their three-week offensive in Warsaw, which has claimed hundreds of lives and created a refugee crisis. While moderate politicians are urging Jews to exercise “restraint” in their retaliation against the Nazis, most European leaders are denouncing Jewish retaliation as “disproportionate.”

Joseph Goebbels, a charismatic spokesman for the popular National Socialist German Workers Party, described the aftermath of Jewish strikes as “dramatic” and said Jewish forces had struck “very important elements of infrastructure,” demanding that perpetrators be brought to justice at a press-conference in Berlin on Wednesday. “Jews must be held accountable for their war crimes, terrorism, and systematic human rights violations committed against the Aryan people,” Mr. Goebbels said.

Miscalculations by Jews and Nazis have weakened Europe’s fragile unity. A ceasefire is needed immediately. Where is Zionist exit strategy? Jewish hawks have started a war without any plausible objectives, any viable plan for disengagement, or any rational assessment of costs and benefits. Are they ready to absorb damage on the home front?

The Jews’ bloody response to concentration camps has united their enemies and divided their friends, the results of a current poll show. Atrocities committed by the Zionist militants in Warsaw and elsewhere have appalled Western opinion. The stature of the Gestapo grows, and the uprising has succeeded in discrediting moderate Germans and silencing the Nazi leaders in Berlin who were ready to start talking instead of killing.