"As in an earlier message threatening Italy, the message is signed by 'Rakan Ben Williams' - or 'bin Wilyamz', as it is written in Arabic - and by the purported al-Qaeda mouthpiece, the Global Islamic Media Front (GIMF). "
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They have been mentioned before and found to be authentic Al Qaeda affiliates.
Oh, I don't doubt that. I'm just curious about this ADNKI group and why they felt it was necessary to publish this. There's no end to the number of stories you could publish with the theme of "[Al-Qaeda affiliated group] threatens to do [spectacularly barbaric act]". Apparently ADNKI is an Arabic language "news" source based somewhere in the Mediterranean with some kind of Italian affiliation. Until I can read what the original Arabic side says, I will continue to strongly suspect that ADNKI itself is an Al-Qaeda/global jihadist proxy mouthpiece or at least a sympathizer.