The Daily Mail reports that four people have been arrested after disorder in the West Ham end during the clash with Manchester United on Saturday.
The Hammers were beaten 1-0 as Marcus Rashford scored a late winner to down the Irons.
A statement, issued by the police and reproduced by the Mail, has confirmed that the four arrested individuals remain in custody.
It reads: “Four arrests were made and they all remain in custody.
“A 21-year-old man on suspicion of drunk and disorderly behaviour, possession of cocaine, and common assault; a 23-year-old man on suspicion of a public order offence; a 22-year-old man on suspicion of throwing missiles; a 33-year-old man on suspicion of assault of an emergency worker.
“Two other men were detained and will be summonsed at a later date for football-related offences.”
The Irons took a total of 3,173 fans to Old Trafford to watch the game against Ralf Rangnick’s side.
The result means that United have leapfrogged West Ham into the top four, but there are likely to be more twists and turns throughout the remainder of the season, with Arsenal facing Burnley this weekend and Spurs taking on Chelsea in a bitter London derby.
The Hammers are next in action on February 5th against Kidderminster Harriers in the FA Cup, before returning to Premier League action against Watford three days later.