"A handout picture obtained from the twitter user @sylvainpennec shows a white container burning inside a London Underground tube carriage at Parsons Green underground tube station on September 15, 2017. More than 20 passengers were injured, some suffering severe burns, in an early morning explosion on a London Underground train in what police described as a ""terrorist incident,""  the fifth attack in six months in Britain. Emergency services were called around 8:20 am (0720 GMT) after the explosion at Parsons Green station in a leafy southwestern suburb which police counter-terror chief Mark Rowley said had been caused by an ""improvised explosive device."" / AFP PHOTO / @sylvainpennec / HO / ===RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT ""AFP PHOTO / HO / @sylvainpennec - NO MARKETING NO ADVERTISING CAMPAIGNS -  NO ARCHIVES - DISTRIBUTED AS A SERVICE TO CLIENTS"
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