liquids on a plane

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"In contrast to previous reports, the official suggested an attack was not imminent, saying the suspects had not yet purchased any airline tickets. In fact, some did not even have passports. [...]
The official shed light on other aspects of the case, saying that while the investigation into the bombing plot began 'months ago,' some suspects were known to the security services even before the London subway bombings last year.
He acknowledged that authorities had conducted electronic and e-mail surveillance as well as physical surveillance of the suspects."
Source: NBC