Putin Vows Vengeance Against Those Who Brought Down Russian Plane in Egypt

Either this is bad translation or it exposes disinformation:

Russia has identified groups behind plane explosion in Egypt, security chief says

MOSCOW - Alexander Bortnikov, the head of Russia's Federal Security Service, said on Thursday Russia had identified groups behind the explosion of a Russian plane in Egypt, which killed all 224 passengers on board in October, local news agencies reported.

http://m.jpost.com/Middle-East/Russia-has-identified-groups-behind-plane-explosion-in-Egypt-security-chief-says-438306

Could it really be several groups behind the explosion?

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