West Ham vowed to take the "strongest possible action", including life bans for any fans found guilty of anti-Semitic chants at Tottenham.
The Football Association is set to investigate apparent abuse where Hammers fans on Sunday appeared to mock the gassing of Jews in the Holocaust.
West Ham said in a statement: "West Ham United are in contact with Tottenham Hotspur to assist them with their investigation into the conduct of a small number of supporters and alleged inappropriate chanting during yesterday's match at White Hart Lane. West Ham United will take the strongest possible action against any of their supporters."
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