Who could be behind hoax bomb threats to European air travel?
BBC News · Frank Gardner ·
There is no hard evidence so far linking airline bomb threats to Russia, Iran or any proxy groups.
The warnings came in thick and fast, targeting one airline or airport after another.
At least 21 flights and several airports across Europe were affected by bomb threats on Thursday.
In nearly all cases - London's Heathrow airport being a notable exception - they were taken to be credible enough to divert the aircraft in question, or even in Italy's case, to scramble fighter jets to escort it.
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