A “terrorist cell” made up mainly of radicalized young Frenchwomen has been dismantled by security forces, the Paris prosecutor said on Friday, after a car filled with gas canisters was found last week in the heart of Paris.

The prosecutor, François Molins, whose office handles domestic terrorism investigations, said that the women had been “guided remotely” from Syria by the Islamic State group, and that they had links to assailants in previous terrorist attacks in France.

One of the women had even been engaged to be married to two assailants, the killer of two police officers in June and the killer of a priest in July, he said.

Mr. Molins said the use of a terrorist cell made up almost entirely of young women represented a chilling turn in the Islamic State’s tactics.