Event:
Russia's Federal Security Service assassinates Magomedali Vagabov, a militant leader reportedly responsible for the 2010 Moscow Metro bombings
More Notable Events on August 21:
1993 NASA loses contact with Mars Observer
1989 Voyager 2 begins a flyby of planet Neptune
1968 Democratic Convention opens in Chicago
1968 Warsaw Pact forces enter Czechoslovakia to end reform movement
1897 Oldsmobile begins operation as a General Motors Corp division
