Immediately in the wake of the 20 July Plot on Hitler's life in 1944, Kaltenbrunner was summoned to Hitler's wartime headquarters at the "Wolfsschanze" (Wolf's Lair) in East Prussia to begin the investigation into who was responsible for the assassination attempt. Once it was revealed that an attempted military coup against Hitler had been launched, Himmler and Kaltenbrunner had to tread carefully, as the military was not under the jurisdiction of the Gestapo or the SD. Since the attempt failed, the conspirators were soon identified. An estimated 5,000 people were eventually executed, with many more sent to concentration camps.