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Harrison, 22, the world number two, defeated Gibbons in a close final with two scoring throws.
British Prime Minister David Cameron, who was in the audience with Russian President Vladimir Putin, commiserated with Gibbons, Britain`s first judo medal winner since Sydney in 2000, as she left the mat.
Audrey Tcheumeo won France`s sixth judo medal of the Games By defeating Abigel Joo of Hungary for bronze.
Brazil`s Mayra Aguiar also continued her country`s judo successes, beating Marhinde Verkerk of the Netherlands to take the other bronze, the Brazilian team`s third judo medal.