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Members of the emergency services work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station.
Police and ambulance services said they were responding to an "incident" at Parsons Green underground station in west London on Friday, following media reports of an explosion. "We are aware of an incident at Parsons Green tube station. Officers are in attendance," London's Metropolitan Police said on Twitter. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Members of the emergency services work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station.
Police and ambulance services said they were responding to an "incident" at Parsons Green underground station in west London on Friday, following media reports of an explosion. "We are aware of an incident at Parsons Green tube station. Officers are in attendance," London's Metropolitan Police said on Twitter. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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How Underground terror incident unfolded

London police are treating an incident on a train at Parsons Green Tube station as terrorism. Witnesses saw a "small explosion" on the District Line train.

How Underground terror incident unfolded

London police are treating an incident on a train at Parsons Green Tube station as terrorism. Witnesses saw a "small explosion" on the District Line train.