Commuters walk outside Parsons Green station, which was re-opened in the early hours of the morning following a bomb attack on a packed underground train, in south-west London on September 16, 2017. British police arrested an 18-year-old man on September 16, 2017, in connection to their investigation into the bombing on a packed London Underground train, which injured 30 people. / AFP PHOTO / CHRIS J RATCLIFFE