A petrol station in Dagenham was closed following an incident that left three men suffering from injuries.
Police were called to a Shell petrol station on Rainham Road South after being alerted to an incident.
A spokesperson for the Metropolitan Police said: "Officers were contacted at around 1.55am on Saturday, 9 December following reports of an incident in Rainham Road South, Dagenham.
"Police and London Ambulance Service attended the scene. Three men were found with minor injuries and were taken to hospital."
A man in his 20s was among the three found with injuries, and was arrested on suspicion of causing grievous bodily harm (GBH), possession of an offensive weapon, and theft.
A crime scene was in place but was closed at approximately 12.30pm.
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Enquiries into the incident are ongoing and anyone with information is asked to call police on 101 or tweet @MetCC quoting CAD 605/09DEC.
You can also report information anonymously to the independent charity Crimestoppers on 0800 555 111.
The London Ambulance Service has been contacted for comment.
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