Celtic fans display Palestinian flags in support of Palestine amid the ongoing conflict between Israel and the Palestinian Islamist group Hamas before the match Action Images via Reuters/Jason Cairnduff
Thousands of Celtic supporters defied the club and displayed Palestine flags ahead of their Champions League clash with Atletico Madrid.
A tifo display in the colours of the Palestine flag was evident in the lower half of the standing section well before kick-off and about two dozen sizeable flags were flown in the adjacent section before the teams emerged.
Thousands of smaller flags were evident around the ground when the teams came out.
The displays will inevitably lead to UEFA disciplinary action against Celtic, given the European governing body has already fined the club for fans flying Palestine flags on previous occasions.
The club issued a plea to supporters earlier on Wednesday after the Green Brigade fans' group encouraged supporters to "courageously fly the flag for Palestine" amid the escalation of the conflict in the Middle East that has claimed thousands of lives.
"We have witnessed death, violence and destruction in the Holy Land in recent weeks, with thousands of people - men, women and children - killed, injured and displaced," read Celtic's statement.
"We are witnessing a tragedy of horrendous scale. As it continues, everyone at Celtic prays for all who have been affected.
"We also hope and pray for peace and for humanitarian support to reach those who are in need and in fear.
"Many of our colleagues, supporters, friends and families have been affected by these events.
"Against this backdrop of conflict and pain, sport can promote peace and demonstrate humanity and empathy for all who continue to suffer."
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