West Ham vice-chairman Karren Brady says the club did all they could to prevent any trouble in their EFL Cup game with Chelsea on Wednesday night.
Police made six arrests after skirmishes broke out towards the end of the stadium's first London derby. Three of the six arrested have been charged, the Metropolitan Police said, while up to 200 people are facing banning orders.
Police and stewards battled to maintain segregation behind the goal being defended by West Ham as coins, seats and other objects appeared to be thrown between rival supporters.
The Hammers and Chelsea condemned the unsavoury scenes which are now under investigation by the Football Association - and swift and decisive action is being taken after the CCTV footage was pored over on Thursday.