Police are investigating separate allegations of racist abuse in two matches from the Championship on Saturday.
Two Birmingham City supporters were arrested after an allegation that Nathan Thompson, a Peterborough United defender, was subject to racist abuse.
Swansea City also reported that Rhys Williams, a Liverpool on-loan defender, was subject to racist abuse from a Luton supporter during their match at Kenilworth Road against the Hatters.
Birmingham said in a statement: “Birmingham has been made aware of a reported incident of racism during this afternoon’s Sky Bet Championship match versus Peterborough United.
“A complaint of racist abuse from visiting supporters was made to the referee, Jarred Gillett, by a Peterborough player during the match at the Weston Homes Stadium.
“Two supporters have been arrested and are in custody. The Club will continue to assist the Police in their investigations and firmly support the action taken against anyone found guilty of such abhorrent behaviour.
“We reiterate our zero-tolerance policy towards any form of discrimination. Football’s rich history is built upon and stronger for its diversity. There will be no further comments at this moment.
Swansea stated that they had submitted a formal report to Tony Harrington, the match referee, alleging racist abuses against Williams. They also added that Bedfordshire Police were already involved.
A club statement read: “Towards the end of today’s Championship fixture against Luton Town at Kenilworth Road, an allegation of racial abuse was made over comments made towards Swansea City’s Rhys Williams from a home spectator.
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“An official report was filed with the match official, Tony Harrington, and Bedfordshire Police at full-time.
“Swansea City denounces racism and abuse of any kind. This is because it does not belong in football or in any other walk of life.
“The club would like to place on record its thanks to both Bedfordshire Police and Luton Town Football Club for their swift response at the end of the game.
“The incident has been investigated by the Bedfordshire Police. Officers were on the ground to investigate and have been working with Luton Town for the identification of the suspects.
“Rhys has the full backing of everyone at the football club and we are in dialogue with his parent club Liverpool with regards to ensuring the player has all the support he needs.
“Swansea City is committed to continuing its cooperation with the authorities.”
Williams’s parent-club Liverpool later tweeted their support for the on-loan centre-half: “We’re with you, @rhyswilliams01. #RedTogether