There were no reports of any injuries, according to British Transport Police LONDON: Passengers were forced to smash their way out of a London Underground train in south London following a fire alert on Friday evening. The train was stopped at the Clapham Common station and people were seen breaking the train"s windows and attempting to climb out. There were no reports of any injuries, according to British Transport Police. In a statement, BTP said: “The issue is believed to have been caused by brake dust which can often be confused with burning.” A spokesperson for Transport for London (TfL) added: “We"re sorry for the distress caused at Clapham Common. The London Fire Brigade attended the station and confirmed there was no fire. We are investigating the details of this incident.”