inputs: hypothesis: Charing Cross is in London. premise: The police have cordoned off roads around Upper Woburn Place following a massive explosion on a bus in the vicinity. Traffic is at a standstill in many places in the capital. Defra's security branch are reporting that police are advising everyone in London not to use any public transport and the Cabinet Office are advising staff to remain in offices until further notice. A further email sent to all staff by Defra's permanent secretary indicates that Charing Cross and Waterloo mainline railway stations have been closed down for police searches, and that other stations could close for similar reasons later today.