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Authorities are said to be deactivating a second improvised explosive device found at the scene where several commuters were injured after an explosion.

Met Police refused to comment, saying there was “an incident” at the London tube station.

A journalist for The Daily Telegraph has tweeted: “Police just told us there is a second bomb they are trying to deactivate. #Parsonsgreen”

In a later tweet she wrote: “Police officer at scene: 'There has been a terror attack on the train. Get inside'.”

At around 8.20am today an explosion ripped through a packed tube train at Parsons Green on the District line, between Earls Court and Wimbledon.

Pictures posted on social media appeared to show wires protruding from a flaming bucket inside a plastic carrier bag on the floor of a carriage.