A "minor explosion" triggered an evacuation at London's Southgate tube station on Tuesday evening, police said, adding that a number of people received minor injuries.
Police have cordoned off the Southgate tube station after reports of the explosion. "No serious injuries reported and enquiries continue".
The station, about eight miles from central London, was closed and the area cordoned off amid reports of a suspicious package.
They closed the station and said officers were dealing with a suspicious package.
British Transport Police added that "we do not believe this to be terror related".
Paramedics treated five people at the scene and took two to hospital.
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A Twitter user with the handle @nakzokulah posted: "I was at Southgate Station when this commotion started".
Metropolitan Police officers are at the scene along with the British Transport Police, London Fire Brigade and London Ambulance Service.
"Officers are on scene alongside @metpoliceuk".
He told the Standard: "The police moved us on, but they said there was an explosion in the station".
Scotland Yard said later that the cause appeared to be a "battery short circuit".
Police say no cause has yet been established.