London Underground commuters took matters into their own hands after carriages appeared to fill with smoke.
Videos circulating on social media appeared to show commuters on the platform at Clapham Common Underground Station smashing the glass with tools including hammers in order to escape and help other passengers off the service on Friday.
Other clips showed panic-stricken travellers forcing their way out of the windows from inside the carriages.
A British Transport Police spokesman said the smoke was caused by "brake dust which can often be confused with burning" coming from a faulty train.
London Fire Brigade also confirmed there was no fire on the train.
A spokesperson told Sky News: "BTP received a report of a faulty train at Clapham Common station shortly before 6pm this evening, and we are aware of a video showing passengers trying to leave the train.
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"There were no reports of any injuries and the incident has now been resolved."
A TfL spokesperson said: "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."
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