European football’s governing body opened a disciplinary investigation after fans of Israel’s Maccabi Haifa unfurled a banner reading “Murderers since 1939” during a Europa Conference League qualifying match against Poland’s Rakow Czestochowa on Thursday in Debrecen, Hungary. Polish President Karol Nawrocki called the banner “scandalous” and said it insulted the memory of Polish citizens, including three million Jews, killed in World War II. Interior Minister Marcin Kierwinski demanded “strong condemnation,” while the Polish foreign ministry summoned Israel’s ambassador. The Israeli Embassy in Warsaw also denounced the act, saying it did not reflect the majority of Israeli supporters. UEFA said the probe will cover the banner and other reported misconduct involving both clubs, including an altercation during a pre-match training session. If charges are upheld, sanctions could range from fines to stadium closures. On the pitch, Rakow won 2–0 to overturn a first-leg deficit and progress 2–1 on aggregate, a result overshadowed by the diplomatic row.