London Fire Brigade has confirmed the alarm has been triggered, but there is no sign as yet of any fire.
Major emergency at London Waterloo. Whole station has been evacuated - reasons why are unclear as of yet.
For most people, a journey from London to Dover and back is a simple matter of getting in the car or on a train - and a couple of hours later, the journey's over. But this weekend seven lads from Kent are doing that trip, both ways - on scooters.
David Johns went to see them preparing for their epic journey and spoke to Nick Hardinges and Luka Syplywczak.