Passengers appear to have been forced to smash the windows of a London Underground train to escape as smoke filled the carriages.
In videos circulating on social media, workmen can be seen outside a train at Clapham Common Station smashing through the windows with hammers to help people get out of the tube.
Witnesses sharing videos on Twitter claimed that the doors would not open as smoke travelled through the carriages, with others criticising the response from station staff.
Jake Sharp, who shared a picture of the chaos, wrote: “Stuck on the train at Clapham Common and carriages filling with smoke, doors won’t open if it wasn’t for workmen on the platform we wouldn’t have got out @TfL you should be ashamed!