The Metropolitan Police has confirmed it made seven arrests as a result of the crowd trouble that overshadowed West Ham's 2-1 win over Chelsea in the EFL Cup fifth round on Wednesday.
Stewards and police in riot gear were forced to come between supporters squaring off in the Sir Trevor Brooking Stand of the London Stadium in the final minutes of the first derby match to be held at the former Olympic venue, while plastic bottles and several chairs were thrown.
West Ham and Chelsea both condemned the ugly scenes after the game and pledged to work with police to review CCTV footage and take action against any of their supporters found to have participated in the incidents, while the home side could also face sanctions from the Football Association.