Abdelhamid Abaaoud, a Belgian of Moroccan origin linked to a series of extremist plots in Europe over the past two years, died in Wednesday's assault by elite police units on an apartment in northern Paris. A second person also died in the raid, but their identity remains unclear.
The 28-year-old Abaaoud was thought to have been in Syria -- where he had boasted of planning attacks on the West -- and his presence in France raises troubling questions about a breakdown in intelligence and border security.
Abaaoud was involved in four out of six attack plots foiled in France this year, he said, but Paris had received "no information" from other European countries about his arrival on the continent.
"It is urgent that Europe wakes up, organises itself and defends itself against the terrorist threat," he told reporters.
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The Islamist was the subject of an international arrest warrant issued by Belgium -- where a court had in July sentenced him in absentia to 20 years in prison for recruiting jihadists for Syria.
Abaaoud was linked to a foiled April plot to attack a church near Paris, Cazeneuve said, and police were also probing possible links to a thwarted assault on a high-speed train from Amsterdam to Paris in August.
As the Paris probe widened to countries across Europe, Belgian police arrested nine people in Brussels, seven of them in raids linked to a suicide bomber who blew himself up outside the French national stadium last Friday, prosecutors said.