Intelligence obtained by Western security agencies before the November 13 Paris attacks indicated that Abu Mohammed al-Adnani, the head of ISIS' external operations efforts, was the key figure behind the ambitious plot, CNN reported citing a senior European counter-terrorism source.
As many as 60 ISIS fighters had been deployed by the group to Europe to carry out attacks on five cities and had already reached European soil, the source said.
The intelligence indicated that the target cities included Paris, London, Berlin and a major population centre in Belgium. However, there was no indication the plan was to attack the cities simultaneously.
The source cautioned that the threat stream was based on intelligence, which was fragmentary and difficult to verify, and it was too vague to act on.
In addition, there was no specific intelligence prior to the Paris attack on any moving parts of the plot, the report said.
"In terms of ambition, it also just pointed towards something we already knew. ISIS had hardly made it a secret it sought to target Europe," the source was quoted as saying.
In the year before the Paris attacks, Adnani had threatened the European countries supporting the anti-ISIS coalition in a series of audio messages, making specific references to France and Belgium.
And in January 2015, Belgian police broke up a major ISIS plot in Belgium coordinated by Abdelhamid Abaaoud, who later became the ringleader of the Paris attacks in which jihadists slaughtered 130 people in a series of bombings and shootings.
The source said Western intelligence agencies believe Adnani is at the heart of ISIS' international attack planning.
"As far as we're concerned, he is top of our target list," the source said.
The source said the lack of specific intelligence on any moving parts of the Paris plot has caused consternation, because it is rare for any plot to fly completely under the radar.
Western security agencies had picked up at least some specific chatter on planning, which they later realised related to the attack, the source said.
After the Paris attacks, new attention was focused on the fragmentary intelligence indicating 60 ISIS operatives had been deployed to Europe.
"The worry has been that if, say, 20 were involved in the Paris attacks, there might be 40 or so still out there," the source said.
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