Officers from the Mets counter terrorism command are investigating a reported explosion and fire on board a District line train at Parsons Green station, south west London, at about 8.20am. Pictures posted on social media appeared to show a flaming bucket inside a plastic carrier bag on the floor of a carriage. A number of people have suffered injuries, with reports of a stampede taking place as commuters tried to flee the station. A Met spokesman said: We urge the public to remain calm but alert and if you have any concerns, see or hear anything suspicious then contact police. Emergency services are at the scene and the District line is currently suspended between Earls Court and Wimbledon. Prime minister Theresa May is to chair a meeting of the Governments Cobra emergencies committee this afternoon to discuss the incident. She said: My thoughts are with those injured at Parsons Green and the emergency services who, once again, are responding swiftly and bravely to a suspected terrorist incident.