MasterCard Inc., already facing at least 12 U.K. lawsuits after European Union regulators outlawed cross-border card fees, was sued by Deutsche Bahn AG and J Sainsbury Plc.

The German state rail company’s case, filed in a London court on Dec. 18, has over 21,000 other claimants spread across five separate corporate groups. They’re suing over “unlawful interchange fees,” Nicola Boyle, a lawyer at Hausfeld LLP representing the groups, said in an e-mail Dec. 20.

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