Perhaps they've been reading PPRuNE...
This was posted on another thread...
I stood several days ago in the check-in queues at Terminal 3 at Manchester hysterically watching the security staff removing small liquids from a group of children under 10 years of age. The queue snaked its way back for as far as the eye could see and the mayhem ensured that departures were being delayed by upto an hour.
It dawned upon me that if anyone wished to carry out an aviation related attack on a huge scale without even boarding an aircraft, all they need do was detonate a device in the packed concourse waiting to go through security. Passengers are not screened before they go into the terminal and can take anything they want into such congested areas.