Hertha Berlin have lashed out at those groups clashing in the German capital's neighbourhood of Moabit on Saturday.
Nearly 100 arrests were made when Hertha and Eintracht Frankfurt supporters clashed violently on a busy crossroads in the neighbourhood of Moabit before their Bundesliga game on Saturday.
While the background of the clashes between the fan groups, which led to 96 arrests by Berlin's police and six injured people, remains subject to a police investigation, Hertha sporting executive Michael Preetz has made it clear that those arrested have no place inside a Bundesliga stadium.
"We don't want those people in a football stadium," Preetz said in local paper BZ, adding that there is only so much a football club can do outside their own premises.
"No club official wants to see those scenes in connection with a match. In our eyes, they are not fans. We will try to identify whoever is willing to resort to violence on streets. We don't call them fans, but rather criminals."
Beusselstrasse in Moabit is home to one of the meeting points of Hertha ultras, and Preetz said that according to the club's sources Frankfurt supporters made their way to "die-hard Hertha fans."
Preetz was backed by the club's fan liaison officer Donato Melillo in Berliner Zeitung.
"A case can be made that the [Hertha ultras group] Harlekins were surprised in their bar," he said.
Also in Berliner Zeitung, fan expert Jonas Gabler said he wasn't suprised by the riots because "the conflict has been grinding on for a longer time."