“British Transport Police are not commenting on reports that it has beefed up security presence at subway stations and airports after new information emerged about the possibility of an attack being planned in or near London.
‘We don’t have armed officers in our stations,’ the agency said Friday. ‘We have been briefed about how to respond to a Mumbai-style gun over the last few months. We don’t comment on deployment of officers but I can tell you that we haven’t cancelled any leave.'”
Source: Police silent on security as threat level for London is raised – CNN.com