West Ham has promised to enforce life bans as the Football Association prepares to investigate crowd trouble.
The Football Association has confirmed it will investigate the crowd disturbances that occurred during West Ham's Premier League match at home against Watford on Saturday.
The Hammers gave up a 2-0 lead to lose 4-2 in their second home league match at London Stadium, the converted venue from the Olympic Games in 2012.
The capitulation by Slaven Bilic's team sparked trouble among sections of the West Ham support.
Journalists and supporters present at the match questioned the readiness of stewards at the stadium to react to problems in the stands.