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 life time ban for all Leeds United games," the club said in a statement.