What we know so far about the London Underground Explosion

Emergency services outside Parsons Green station in west London after Scotland Yard declared a terrorist incident following a blast sent a "fireball" and a "wall of flame" through a packed London Underground train.
Emergency services outside Parsons Green station in west London after Scotland Yard declared a terrorist incident following a blast sent a "fireball" and a "wall of flame" through a packed London Underground train.

Breaking