USA's victory over Japan in the women's gold medal football yesterday was marred by a slew of racist tweets.
The 2-1 match had barely ended when the terms 'Pearl Harbor' and 'Japs' started trending on the micro blogging site.
Olympics fans tweeted how the U.S. victory had been 'payback for Peal Harbor' and made reference to the Hiroshima and Nagasaki atomic bombs dropped by the U.S. military in WWII.
Before the match ended one wrote the game would end 'the same way WWII did. With Hiroshima and Nagasaki burnt to the ground'.
The game - and the tweets - fell on the 67th anniversary of the Nagasaki atomic bomb attack, which killed 70,000 people on August 9, 1945.