Seven arrested at West Ham vs Chelsea match
The first ever London derby to take place at the London Stadium was overshadowed by crowd trouble between both sets of fans. The trouble resulted in seven fans being arrested by police.
Plastic bottles, seats and coins were reported to have been thrown during West Ham's 2-1 win against Chelsea at the London Stadium as hundreds of supporters clashed with riot police entering the concourse to manage the trouble.
The behaviour by the supporters involved as described by West Ham manager as Slaven Bilic "unacceptable", adding: "We are totally against it as a club."
West Ham have said they will ban any fans involved for life and is confident it can identify those responsible via its high-definition CCTV system and through fans' ticket purchasing history.
The Football Association and EFL are also investigating. A spokesman for the EFL called the incidents "distasteful and unwelcome".
The security at the stadiu was boosted for this match with an alcohol ban being imposed as part of a "robust policing plan" following as a responce to recent crowd trouble at the stadium this season.
The match was the first time that the Metropolitan Police deployed officers inside the stadium. Police previously weren't deployed inside the ground because the radio system emergency services use to communicate will not be operational until 2017.
The Metropolitan Police, who arrested seven people for alleged public order offences, described Wednesday's incidents as "unacceptable" and said 30 people were prevented from attending the match.
It said part of its investigation will include "a leaflet handed out before the match containing homophobic contents". Images on social media before the game appeared to show a song sheet being distributed with homophobic lyrics aimed at Chelsea defender John Terry and striker Diego Costa.
West Ham told BBC Sport it was "investigating the alleged distribution of these flyers" and would "take the strongest possible action against those responsible".