Ahead of Saturday's fixture, Birmingham had reminded supporters about acceptable behaviour via its website and social media after Welch had received misogynistic abuse when she took charge of the club's defeat to Preston North End in January. That game marked the first occasion in which a female official had refereed an English second tier game. Welch went on to make further history by being appointed as fourth official for Fulham's defeat to Manchester United in the Premier League earlier this month.
On Sunday, Birmingham expressed their disappointment at the arrests, stating: "Birmingham City strongly condemns all forms of discrimination and will support the police with their enquiries."