Arsenal were left stunned on Saturday after a member of their media team was attacked by a West Ham fan.
The two teams clashed at the London Stadium but the encounter was marred after an Arsenal camera man, who works for the in-house TV channel, was punched by a Hammers fan as he carried out his duties.
The employee is now recovering and West Ham are working to identify the culprit.
It's the latest in a growing line of problems at West Ham's new home.