Two shop assistants were allegedly assaulted at a Sports Direct store in Beckton on Friday.
Emergency services were called to the store, in Gallions Reach Shopping Park, where they found two staff members suffering from injuries.
A Met spokesman said that four males, aged between 14 and 22, were arrested in connection with the incident and were taken to an east London police station.
In a statement, a spokesman for Gallions Reach Shopping Park, said: “We are aware of an incident at one of the retail units within Gallions Reach Shopping Park, Beckton, on the afternoon of 21st August.
“Following the intervention of our security team and the attendance of the emergency services, this was swiftly brought to an end.
“As the police investigation into this is ongoing we are unable to comment further at this time.”
Those arrested have been bailed until a date in October.
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