What was supposed to be a moment of silence to honor the victims of the Paris attacks devolved into a wave of vitriolic booing during Turkey’s game against Greece on Tuesday, which ended 0-0 with more than 17,000 people in attendance.

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“Our fans should have behaved during the national anthems and during the one minute silence,” Turkey’s manager Fatih Terim said after the match. “Greece is our neighbour. Today is world neighbours day, but our fans didn’t behave like neighbours in this match.”

Reuters reporter Ece Toksabay was at the game and reported hearing chants of “Allahu Akbar,” a claim also reported by CBS, among others.

Some within the country refute the reports, however, saying a number of fans were booing those who orchestrated the attacks, while others were chanting against terrorism more generally stemming from Turkey’s history with the Kurdistan Workers’ Party. Some reports say Turkish fans’ booing during Greece’s anthem was due to tension between the two countries amid the ongoing refugee crises in the region.

The Independent also reports on reaction from those on social media who say fans were booing as a sign of protest because international teams didn’t hold a minute of silence following the Ankara terror attacks in October: