The ringleader behind the Nov. 13 attacks in Paris had plans to strike Jewish targets and to disrupt schools and the transport system in France, according to sources close to the investigation.

Abdelhamid Abaaoud, a Belgian national of Moroccan origin, also boasted of the ease with which he had re-entered Europe from Syria via Greece two months earlier, exploiting the confusion of the migrant crisis and the continent's passport-free Schengen system, the sources said on Friday.

The witness statement also described how Abaaoud had boasted about slipping into Europe with refugees fleeing Syria's civil war and then spending two months in France undetected prior to the Nov. 13 attacks.

"France - zero," it quoted him as saying.