West Ham vs Chelsea: Arrested 4 after huge crowd outbreak in London Stadium read more at here www.spinonews.com/index.php/item/1432-west-ham-vs-chelsea-arrested-4-after-huge-crowd-outbreak-in-london-stadium

It is the latest outbreak of disorder at West Ham's new ground this season.

Plastic bottles, seats and coins were thrown during the Hammers' 2-1 victoryat London Stadium as hundreds of supporters clashed and riot police entered the concourse.

Crowd trouble marred West Ham's EFL Cup fourth-round home win over Chelsea, with police making seven arrests.

West Ham boss Slaven Bilic called the behaviour "unacceptable", adding: "We are totally against it as a club."

The Premier League club says it 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.

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.

The Football Association and EFL are also investigating. A league spokesman called the incidents "distasteful and unwelcome".

Security was boosted for the London derby and an alcohol ban imposed as part of a "robust policing plan" following crowd trouble at the stadium this season.

Until Wednesday's match, the Metropolitan Police have not deployed officers inside the stadium because the radio system emergency services use to communicate will not be operational until 2017.

This season, the Hammers' first at the former Olympic Stadium following their move from Upton Park, 23 fans have been banned from the ground.

Four people were arrested following disorder at the Premier League match against Middlesbrough on 1 October, while there were clashes in the stands during the defeat by Watford in September.

The Metropolitan Police, who made seven arrests 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".