The Football Association will push for life bans to be imposed on the fans whose behaviour marred Tuesday night's Carling Cup tie between West Ham and Millwall. The FA are looking into the events that saw a man stabbed outside Upton Park and pitch invasions occur following West Ham's first two goals and again at the final whistle.
A spokeswoman for the Metropolitan Police said officers had made several arrests and were scanning CCTV footage to identify hooligans.
FA director of communications Adrian Bevington said on BBC Radio Five Live: "We have to understand exactly what measures were put in place last night.
"I'm not going to condemn West Ham or Millwall football clubs for any of their actions - certainly not at this stage, because we don't know exactly what's been put in place.
"And we know there have been huge efforts on the parts of all our clubs to try to eradicate the problems and we've had a history of success on that.
"However, we have to make sure that the individuals concerned face such tough actions that they can't go to football again.
"We all want a big atmosphere at matches - that's part of football, part of the passion.
"However, we also want to make sure it's a safe environment to watch games and we've just spent the best part of 20 years working towards that."
"We haven't eliminated it, that's certainly true," he said.
"We haven't yet had figures for last season but Home Office figures for the four previous seasons to that showed the lowest level of disorder since those records started being kept."
He added: "Anybody who goes regularly to football matches and has done for 20 or 30 years as I have, is in no doubt that the amount of disorder is far less than it was, say, 20 years ago.
"That is not to diminish last night, that was obviously an extremely serious matter.
"The question is, why did it occur at that particular game when the trend over recent years has been in the opposite direction?
"Part of the investigation would need to look at whether appropriate measures were put into place to deal with the situation," he said.