Marco Reus said Borussia Dortmund's performance against Darmstadt was "not acceptable" as his side suffered a 2-1 defeat.
Ralph Hasenhuttl was unhappy with RB Leipzig's defending of set-pieces as they dropped more points in the Bundesliga title race with a home defeat.
Bayern Munich looked sluggish throughout their Bundesliga encounter with Ingolstadt, only for Arturo Vidal to secure a win with his 90th-minute goal.
Police in the state of Hessen say they stopped two buses of Dortmund fans and found them armed with flares, combat gloves and balaclavas.
Injury-plagued Dortmund suffered a 2-1 defeat to a Darmstadt side who had not won a Bundesliga match since October.
Philipp Lahm said Bayern Munich were "lucky" to win 2-0 in Ingolstadt as last-gasp goals from Arturo Vidal and Arjen Robben grabbed a late victory.