London Fire Brigade has confirmed the alarm has been triggered, but there is no sign as yet of any fire.
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.
Hundreds of protesters gathered at Westminster today in support of a Gurkha who's been on hunger-strike for 13 days. Gyanraj Rai is demanding that 25,000 Gurkha veterans are given the same pension rights as their British comrades.
Meanwhile, a teenage boy from Kent has launched a Government e-petition in support of the hunger striker. John Ryall reports.
He's just 13 years old but a remarkable schoolboy from Kent has begun a campaign to save a Gurkha veteran on hunger strike over pension rights. George Taylor has visited Gyanraj Rai near Downing Street - hoping to talk him out of his protest.
The former soldier wants the rules changed that prevent some Gurkhas receiving the same pensions as their British counterparts. It's part of a long-running campaign for equal rights. John Ryall has our exclusive report.
Disruption on South West Trains between Reading and London Waterloo due to signalling problem at Wokingham.
Tickets are being accepted on First Great Western between Reading and London, and London Underground services.
It is the beginning of the end of paper rail tickets for some Southern passengers travelling into London.
Commuters using the Brighton line into the capital will be able to use smart-cards, similar to Oyster-cards, at East Croydon, Clapham Junction, London Victoria and London Bridge.
The scheme will be widened out to all London stations as of next year.
Baroness Kramer launched the new scheme yesterday.