Black smoke engulfs central London as fire breaks out in tunnel

Black smoke is engulfing a central London district after a blaze erupted in an underground tunnel - with 70 firefighters sent to tackle the flames. Surrounding roads in Holborn have been closed, with travel chaos reported as crews battled to control the scene. The London Fire Brigade urged people to stay away from the area, amid warnings of 'significant disruption' in the heart of the capital.