Fifa has started disciplinary proceedings against Mexico after alleged homophobic chants by their fans during their World Cup match against Cameroon last Friday. In a statement, Fifa said the inquiry was launched after what they called "improper conduct" by Mexican fans.
Fifa sources told the BBC they are also looking into alleged discrimination by fans from Brazil, Russia and Croatia.
Fifa officials say they also have evidence of banners belonging to a number of far right groups being displayed at Russia's game against South Korea and Croatia's match with Brazil.
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