The most serious attack occurred on November 9, 1938, and is known as Kristallnacht or the “Night of the Broken Glass.” After a Jewish refugee killed a German diplomat in Paris, Nazi officials ordered attacks on Jews in Germany, Austria and the Sudetenland. Secret police and military units destroyed more than 1,500 synagogues and 7,500 Jewish-owned businesses, killed more than 200 Jews, and injured more than 600 others. The Nazis arrested thousands of Jews.