Arsenal investigating video of fan racially abusing Napoli’s Kalidou Koulibaly

• Snapchat video shows supporter using N-word
• Arsenal pledge to identify culprit

Arsenal have launched an investigation after a video emerged online where a supporter can be heard racially abusing Napoli defender Kalidou Koulibaly.

Unai Emery’s side won their Europa League quarter-final first leg meeting 2-0 at the Emirates Stadium but another incident of racism will overshadow the result.

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