Scotland Yard said seven men were arrested for public order offences following the Wednesday night clash in Stratford, east London
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A Chelsea fan has said has spoken of his terror after he and his eight-year-old daughter were pelted with coins as violence broke out during West Ham vs Chelsea at the Olympic Stadium last night.
Scotland Yard said seven men were arrested for public order offences following the Wednesday night clash in Stratford, east London, during which plastic bottles, seats and coins were hurled among the crowd.
The Metropolitan Police said a "significant number" of officers needed to be deployed in the stadium to deal with the "unacceptable" outbreak at the EFL Cup round of 16 derby, which was won by West Ham 2-1.
Commander BJ Harrington, who led the operation, said most fans were well behaved but an unruly minority were "clearly intent on being involved in confrontation and violence".
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He said: "Despite extensive work with both clubs and the London Stadium partners as well as a large and robust policing operation, there were unacceptable incidents inside and outside the stadium, before, during and after the game."
One Chelsea supporter said he and his young daughter were struck by seven coins during the trouble and planned to escalate the matter.
The unnamed man told the BBC: "(She's) been going since she's two. She's never experienced violence like this before or the aggression that we've had to suffer.
"We've never been hit by coins before - to be hit by seven of them in one evening, that's why we've kept them. We want to take this matter further."
Both clubs have issued statements condemning the skirmishes, which are under investigation by police.
West Ham manager Slaven Bilic described the scenes as "unacceptable", while the club "unreservedly" condemned those involved, who they will seek to identify.
The club said: "Once identified, those found to have acted improperly will be banned from attending any West Ham United fixtures for life and we will request the courts serve banning orders to prevent these individuals attending any other football."
London Stadium has been West Ham's home for nine games after leaving the Boleyn Ground in Upton Park in May.
A Chelsea spokesman said: "The club is extremely disappointed to see disturbances at the end of tonight's game and we condemn such behaviour."
