German clubs stand together
Borussia Dortmund and Schalke have issued a joint statement condemning the violence which marred Saturday's Revier derby between the two sides.
The two clubs accused several hundred supporters of both sides of "abusing" the match and "deliberately endangering the safety of the largely peaceful majority of fans and the security services" which their actions.
The clubs are in talks with the police about the events, the said in a statement which appeared on the official websites of both.
Approximately 200 people were arrested as a result of the violence which occurred ahead of the match, won 2-1 by Schalke.
Police and bystanders were among those injured when paving stones, bottles and rubbish bins were used as missiles, while the authorities responded with pepper spray and a water cannon.
Dortmund chief executive Hans-Joachim Watzke said: "The 141st derby should be a celebration of football. Hooligans and criminals, to whom we expressly deny the status as fan, ensured a more than bitter aftertaste."
Schalke chairman Clemens Tonnies said: "Despite all the joy at our derby victory, I am saddened by these events. Now strict action against this violence is required."
Those supporters involved now face stadium bans.
Watzke added: "After analysing the images and in consultation with the police and Schalke we will carry out an individual case review and clamp down.
"We will punish proven serious violations with stadium bans. We are very concerned and apologise to the victims of violent offenders."