Almost 30,000 fans were present at Camp Nou in Barcelona’s home game against Eintracht Frankfurt.
The allocation for away fans was 5,000 but other supporters of the Bundesliga team bought tickets from Barca fans.
The Blaugrana players were whistled at and booed at their own stadium as the Catalans suffered a shock 3-2 defeat and crashed out of the Europa League.
Mundo Deportivo reports say that the players found the atmosphere ‘unbearable’.
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