Was the recent "Toner Cartridge" bomb scare authentic or was it an elaborately inspired hoax?

If it was a hoax, was it intended as some sort of "October Surprise" prior to the midterm elections in order to make President Obama appear presidential? The Daily Telegraph of London reports that Prime Minister Cameron of the United Kingdom was not informed of the threat until after sixteen hours had elapsed following President Obama's learning of the news. One of the bombs was supposedly in an airplane sitting at a British airport.

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