The Football Association has released a statement condemning anti-social behaviour from supporters after several incidents this week, including one involving a Nottingham Forest fan.
A Forest season ticket holder has been jailed for 24 weeks after pleading guilty to a post-match assault on Sheffield United striker Billy Sharp at the City Ground on Tuesday. There has also been trouble at Port Vale, and Everton vs. Crystal Palace in recent days, with the FA now looking to clamp down on such behaviour.
The FA reinforced that it is illegal to enter the playing area, and sent a message to all clubs that they are responsible for stopping such incidents from occurring in the first place.
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In a statement issued today (Friday), the FA said: "We are very concerned about the rise in anti-social behaviour from fans as we reach the end of the season. Football stadiums should always be a safe and enjoyable space for everyone, and these incidents are completely unacceptable and have no place in our game.
"It is illegal to enter the pitch area in any stadium and these actions are putting players, fans and people who run the game at great risk. This simply cannot continue and we can confirm that we are investigating all of the incidences.
"Clubs play a vital role in addressing this issue and they need to prevent pitch invasions from occurring, as well as taking their own action against those that break the rules and the law. The FA will be seeking to do all that it can to work with clubs as well as addressing the issues from a disciplinary perspective.
"We are also reviewing our regulations to help stamp this behaviour out and to ensure the safety of everyone inside a stadium."