Source:
Harry S. Truman: "The President's News Conference," August 8, 1945.
Online by Gerhard Peters and John T. Woolley, The American Presidency Project
http://www.presidency.ucsb.edu/ws/?pid=12166

The President's News Conference
August 8, 1945

[Truman’s Office, White House, 3 PM]

THE PRESIDENT. I have only a simple announcement to make. I can't hold a regular press conference today; but this announcement is so important I thought I would call you in.

Russia has declared war on Japan! That is all!

[Much applause and laughter, as the reporters raced out]