WARSAW (AP) ― UEFA made its first formal charges of racism at the European Championship on Saturday, opening a case against the Croatian soccer association after receiving reports that fans made monkey chants at Italy forward Mario Balotelli.

Croatia is charged with “improper conduct” of supporters, including “racist chants, racist symbols” at a game in Poznan on Thursday, the European soccer governing body said in a statement.

UEFA received reports from anti-discrimination monitors working with Football Against Racism in Europe, who wrote that Croatia fans made monkey noises and displayed far-right nationalist flags.

Balotelli, who is black, started the game for Italy against Croatia, and was replaced in the second half of the 1-1 draw.

“It was fairly consistent throughout the game,” FARE executive director Piara Powar told the Associated Press.