Millwall say they are 'devastated' by the violent scenes that marred their FA Cup semi-final loss to Wigan Athletic at Wembley Stadium and have pledged to find the culprits.
Fans in the Millwall end traded punches during the second half of Saturday's game, with the Metropolitan Police revealing that 14 fans were subsequently arrested; 12 from the London club.
Television pictures showed supporters with blood streaming down their faces after the disturbances, which left four police officers with minor injuries.
Millwall have fought a long battle against hooliganism, which blighted the club in the 1970s and 1980s, and they have vowed to root out the people responsible for Saturday's trouble.
"As a club we are devastated by the scenes we saw yesterday, which are in danger of undoing much of the good work we have done to try and change the perception of the club," said a Millwall spokesman on Sunday.
"We are trying to find the answers to what happened."
Millwall are working with the police and the Football Association to investigate the violence.
"A number of lines of inquiry are being pursued," said a police spokesman.
"There will be a significant post-match review and further investigation will take place to identify those responsible for committing offences."