West Ham have confirmed they are investigating claims that the families of players Victor Obinna and Frederic Piquionne were racially abused by spectators at the weekend.
Reports emerged on Monday that guests of the two strikers were involved in a confrontation with a small group of supporters during Saturday's 4-2 home defeat to Premier League leaders Manchester United.
According to the reports, the families were racially abused while sitting in a box in the Main Stand.
A statement on the club's official website on Monday read: "West Ham United are investigating the events around Saturday's match against Manchester United after allegations of racist abuse.
"The club takes such matters seriously and, with the police, is reviewing CCTV footage and gathering witness information. Anyone found responsible will be dealt with appropriately.
"This is an isolated incident and our supporters, like the club, are proud of the positive relationship with Kick It Out - holding the Racial Equality Standard - and Show Racism the Red Card."