Norwich defender Sebastien Bassong says he was racially abused by someone in the crowd during today's 4-3 win at Swansea.
The Cameroon international reported the incident to referee Howard Webb.
It is understood Swansea identified an individual, and police are now involved.
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A 23-year-old man was arrested on suspicion of a racially aggravated offence.
Former Newcastle, Tottenham and Wolves defender Bassong scored Norwich's second goal during his team's victory.