On 24 June 1922, two months after the signing of the Treaty of Rapallo (which renounced German territorial claims from World War I), Rathenau was assassinated. On this Saturday morning, Rathenau had himself chauffeured from his house in Berlin-Grunewald to the Foreign Office in Wilhelmstraße. During the trip, his NAG Convertible was passed by a Mercedes touring car with Ernst Werner Techow behind the wheel and Erwin Kern and Hermann Fischer in the backseats. Kern opened fire with an MP 18 submachine gun at close range, killing Rathenau almost instantly, while Fischer threw a hand grenade into the car before Techow quickly drove them away. Also involved in the plot were Techow's younger brother Hans Gerd Techow, future writer Ernst von Salomon, and Willi Günther (aided and abetted by seven others, some of them schoolboys). All conspirators were members of the ultra-nationalist secret Organisation Consul (O.C.). A memorial stone in the Königsallee in Grunewald marks the scene of the crime.