 It also prompted Herschel Grynszpan, a Polish Jew, to assassinate Ernst vom Rath, a German Embassy official in Paris, on November 7, 1938, which in turn provided the Nazis an excuse to carry out Kristallnacht, the anti-semitic pogrom of November 9–10, 1938.Eventually the Polish government finally allowed them, in stages, to enter the country.Negotiations between the Polish authorities and the Germans came to an end on the 24 January 1939, when an agreement was signed under which the deportees were allowed to return to Germany, in groups not exceeding one hundred at a time, for a limited stay to settle their affairs and liquidate their businesses.