A large fire is currently preventing Southeastern and FirstCapitalConnect trains from entering or leaving London Bridge. The blaze is beneath railway arches and is believed to involve gas cylinders. Twitterers report major disruption at Waterloo East and Waterloo as a result. Updates to follow.
Update 9.00am: Cannon Street and Charing Cross stations are also reportedly closed following the fire, which took place at a disused railway arch on Debnams Road, Bermondsey at 3am this morning. The Guardian reports that 10 fire engines attended the scene, and 15 people had to be evacuated from nearby flats.