...
one of his sources in the Security Service had told him that AQ had been phoning through false alarms to London stations and then observing the
evacuation to maximise casualities.
%%%%%%
This is what concerns me about seeing emergency drills or, for example, the evacuation of the Capitol, which get shown on TV on a regular basis. Too much info helpful to the terrorists, I think.
This "observation" of false warnings was part of the Embassy bombings. I'd say the next plane over DC gets shot down....without hesitation.
What can you do though - if you get a bomb threat can you risk not evacuating?