Police made one arrest after Arsenal reported a fan for alleged racial abuse directed at their substitutes'bench during the 4-1 Premier League win at Leeds United on Saturday.
Leeds confirmed the arrest, saying the incident occurred in the first half of the match at Elland Road.
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"Racism will not be tolerated at Leeds United and any supporter found to be using racist language will be subject to a lifetime ban for all Leeds United games," the club said in a statement.
Arsenal substitute Rob Holding was pictured talking to the fourth official just after the half hour mark, before a member of Leeds staff was notified.
"I can confirm it and it was reported to stadium manager," Arsenal coach Mikel Arteta told reporters.
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"The authorities will investigate that. One of the players on the bench heard those comments. I don't know exactly who it was directed at."
Arsenal stayed fourth in the Premier League standings after the victory.