Why did pitch invasions become such a prevalent issue in the 2021-22 season? – video

Pitch invasions 'are a traditional form of celebration for fans' and have occurred for years. However, the past season has seen 'a noticeable rise in disorder' accompanying the celebrations. The end of the campaign featured numerous scenes of problematic pitch invasions, with incidents of players being accosted and teams needing to be escorted off the pitch. Paul MacInnes explains what pitch invasions are, why they suddenly appear to be more disruptive and what clubs and authorities think of them.