Matt Frei is Leading Britain's Conversation.
27 October 2016, 13:18
Despite a heavy police presence at the Olympic Stadium, last night's game between West Ham and Chelsea still descended into violence - these are the most shocking videos of the confrontations.
Plastic bottles and seats were thrown in the League Cup match, which West Ham won 2-1. Seven people were arrested as riot police entered the concourse in a bid to control the situation.
Despite an alcohol ban and an increased security presence, the mood towards the end of the game turned increasingly aggressive.
The Metropolitan Police has described the scenes as "unacceptable", a sentiment echoed by both West Ham and Chelsea.
Chelsea fans must take their fair share of the blame for the trouble behind the goal but I am sure the media will just blame West Ham fans! pic.twitter.com/ljoTvhYeq1— West Ham Football (@westhamfootball) October 26, 2016
The home team have promised to give life bans to fans involved in violence last night.
Slaven Bilic said: "For those kind of things to happen, especially in England, is unacceptable."
Chelsea's manager Antonio Conte: "I don't really like to see these situations."