Police have cordoned off the Southgate tube station after reports of the explosion.
Five people have been injured in a suspected explosion at a Tube station.
Emergency services rushed to the area and the station closed down. "No serious injuries reported and enquiries continue", confirmed British Transport Police.
As police's investigations continue, parts of the Piccadilly line have been closed while trains are now not stopping at Southgate due to concerns following the incident.
The busy underground station, which is located in north London, was evacuated at around 7 p.m. local time following the explosion, cops said.
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Twitter user Hal wrote: "I was at Southgate Station when this commotion started".
A police statement said: Officers remain at #Southgate tube station. Cordons are in place and the station is closed. British Transport Police said the incident was not thought to be terror-related.
Scotland Yard said later that the cause appeared to be a "battery short circuit".
Metropolitan Police said the blast was thought to be caused by a battery short circuit.
Enquires are ongoing to establish the "full facts", a Met spokesman added.