West Ham say they have handed over all of their evidence to the police after completing a "thorough and immediate" investigation into abuse shouted at Liverpool's Mohamed Salah.
The incident happened during Monday's 1-1 draw at London Stadium.
Egypt striker Salah, 26, was filmed on a mobile phone from a section of home supporters as he was taking a corner.
The footage, taken by a fellow fan, shows expletives directed at Salah, including about his Muslim religion.
"The club is unequivocal in its stance - such abuse will not be tolerated," West Ham said in a statement.
"West Ham can confirm that it has handed evidence to the Metropolitan Police."
The user who posted the video on Twitter said: "I was disgusted by what I was hearing. People like this deserve no place in our society let alone football matches."