West Ham threw away a two goal lead against Watford on Saturday afternoon, losing the Premier League game 2-4.
However, the performance of some Hammers fans was even more disappointing.
Slaven Bilic's side were pegged back by Watford after two first-half Michail Antonio goals appeared to have set the team on the way to a comfortable victory.
Odion Ighalo scorded the first goal for the visitors before half-time, and Watford had a commanding two goal lead after 64 minutes when Jose Holebas scored.
By this time unsavoury scenes had developed in the stands of the London Stadium.
A section of West Ham fans clashed with stewards and each other, and also attempted to goad travelling Watford fans into fighting.
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The club have since released a statement, promising to ban any individual involved in the fighting.
"West Ham unreservedly condemn the behaviour of the individuals involved in incidents during today’s fixture against Watford. While these isolated incidents were quickly brought under control, this behaviour has no place in football and West Ham will work tirelessly to eradicate such incidents.
"We are currently undertaking an immediate full review with all stakeholders. This includes police, stadium landlord and operator LS185, who are responsible for appointing and managing stewards and security, to ensure we eradicate such incidents moving forward.
"Our policy on this behaviour remains one of zero tolerance and we will work with the police and other stakeholders to identify the individuals involved.
"Once identified, they will be banned from attending any West Ham fixture for life and we will request the courts serve banning orders to prevent these individuals attending any football."
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