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Police were investigating reports of an "explosion" in a carriage of a London Tube train on Friday.
Officers and ambulance service were on the scene at Parsons Green in south-west London, reports the BBC.
Transport for London tweeted: "We are investigating an incident at Parsons Green." Train services between Earl's Court and Wimbledon on the District Line were suspended.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)