WATCH: Terror on London train injures 22 September 15, 2017In what is being treated as a terror incident by the British Transport Police, flammable materials left in a bucket on a London underground train were detonated during the Friday morning rush hour, leading to a fireball which caused a stampede and left at least 22 injured, many with burns.At 8.20am, an improvised device was detonated on a #LondonUnderground train at #ParsonsGreen station. Here’s what happened pic.twitter.com/WqNyai8ON5— Sky News (@SkyNews) September 15, 2017 LondonTerrorism