Tensions boiled over between Millwall and West Ham supporters after an altercation between two fans reportedly ended with one supporter being knocked to the ground by a single punch.
The incident, which took place amid the heated atmosphere surrounding the fixture, appeared to begin after a West Ham supporter allegedly provoked a Millwall fan.
The confrontation quickly escalated before the Millwall supporter responded with a punch that sent his opponent to the floor.
Footage of the incident has since circulated among supporters, with fans reacting strongly to the confrontation.
The brief exchange has added further attention to an already intense rivalry between the two London clubs, where emotions can run high whenever their supporters come together.
While the clip shows the moment the West Ham supporter is struck and falls, the circumstances leading up to the confrontation remain limited to what can be seen and reported from the footage.

The incident has also sparked debate among supporters, with some questioning how quickly the situation escalated and others focusing on the dangers of fan confrontations around football matches.
Neither the rivalry nor the atmosphere surrounding the fixture excuses violence, and incidents such as this can carry serious consequences for those involved.
For supporters attending football matches, the message remains clear: heated exchanges can escalate in seconds, turning a moment of provocation into a potentially serious incident.