September 6: Howard Unruh, a World War II veteran, kills thirteen neighbors in Camden, New Jersey with a souvenir Parabellum P.08 pistol to become America's first single-episode mass murderer. - Allied military authorities relinquish control of former Nazi Germany assets back to Germany.

September 7: The Federal Republic of Germany is officially founded. Konrad Adenauer is the first federal chancellor.

September 9: Albert Guay affair: A dynamite bomb destroys Canadian Pacific Airlines Douglas DC-3 in Quebec. - Notorious World War II veteran Edwin Alonzo Boyd commits his first career bank robbery in Toronto.

September 13: The Soviet Union vetoes United Nations membership for Ceylon, Finland, Iceland, Italy, Jordan and Portugal.

September 17: The Canadian steamship SS Noronic burns in Toronto Harbour with the loss of over 118 lives.

September 19: The United Kingdom government devalues the pound sterling from $4.03 to $2.80, leading to many other currencies being devalued.

September 23: U.S. Harry S. Truman announced that the USSR had the atomic bomb

September 24: Laszlo Rajk, ex-foreign minister of Hungary, is sentenced to death.

September 29: The First Plenary Session of the Chinese People's Political Consultative Conference approves a design for the Flag of the People's Republic of China. - Iva Toguri D'Aquino is found guilty of broadcasting for Japan as "Tokyo Rose" during World War II. (source: Wikipedia)