Now, though, the paranoia is creeping in and I'm thinking "What do they know that we don't, to issue such a proclamation right now?"
http://news.bbc.co.uk/2/hi/uk_news/4673987.stm
The BBC wrote:US troops ordered to avoid London
Thousands of US military personnel based in the UK have been banned by commanders from travelling to London in the wake of Thursday's bomb attacks. Personnel, most of them from US Air Force units at RAF Mildenhall and RAF Lakenheath, in Suffolk, have been told not to go within the M25 motorway.
Family members who are from the US are also being urged to stay away.
The US air force said the order had been made in the interests of the safety of its troops.