The team was also penalized for a different infraction.
(Reuters) - Celtic has been fined 15,200 pounds ($19,000) after its fans waved Palestinian flags during its Champions League match against Atletico Madrid last month in Glasgow, UEFA said on Wednesday.
The flags, which numbered in the hundreds, were deemed to be "provocative messages of an offensive nature," UEFA said in a statement.
Fans, who had been warned by the Scottish club not to display flags before the October 25 game, could be heard singing "You'll Never Walk Alone" while holding the Palestinian flags in a video shared widely on Instagram.
Supporters also unfurled two large banners at Celtic Park that read "Free Palestine" and "Victory to the Resistance."
ALSO READ: Football star Anwar El Ghazi's contract terminated over posts on Israel-Hamas conflict
Gaza's Hamas-run government says at least 13,300 Palestinians have been killed, including at least 5,600 children, in the war with Israel.
Celtic is fourth in Champions League Group E on one point after four games.
The team was also fined 10,000 pounds for fans blocking passageways and using pyrotechnics.