Police made four arrests on Saturday after disorder in the West Ham section during their trip to Manchester United in the Premier League, with officials confirming that two other men were also detained.
The Hammers lost 1-0 at Old Trafford and police responded to disorder in the away end during the clash between the contenders for European football.
In a statement reproduced by the MEN, Greater Manchester Police said: '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.