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Borussia Dortmund live updates
Bayern Munich chairman Karl-Heinz Rummenigge has confirmed he is searching for a mole within the club who is revealing tactical information and internal stories to Germany's Bild newspaper.
According to Bild, coach Pep Guardiola read the riot act on Saturday prior to the top-of-the-table clash with Borussia Dortmund, which the European champions won 3-0.
"Whoever it is, heads will roll," he is quoted as saying. "I'm going to throw that person out and he will never play under me."
Bayern goalkeeper Manuel Neuer was pelted with bananas during the Bundesliga clash at Dortmund on Saturday.
Neuer moved to Bayern from Dortmund's fierce local rivals Schalke in 2011, so he's not the most popular man with their fans.
It's thought Dortmund's supporters were repeating the banana throwing practice they used to dish out on ex-Bayern goalkeeper Oliver Khan, who they dubbed "Ape man."
Dortmund's fans gave their players an incredible post-match reception despite the 3-0 Bundesliga loss at home to Bayern Munich on Saturday.
Watch extended highlights of the game on ITV4 on Monday at 11pm