This footage shows the shocking moment a fight broke out in the West Ham end at the Olympic Stadium as they were dumped out of Europe.
West Ham were knocked out of the Europa League as they lost 1-0 to Romanian minnows Astra Giurgiu and 2-1 on aggregate.
The clip, which was widely watched on social media and showed one supporter punching another in front of security, has sparked anger among fans.
The video shows two stewards escorting a fan out before things turn nasty.