French investigators were on Saturday probing a group of women arrested on suspicion of plotting new jihadist attacks, including an attempted car bomb near Paris's Notre Dame cathedral.
An examining magistrate was being asked to place a suspect, named as 29-year-old Ornella G., under formal investigation over the would-be attack in the heart of historic Paris.
A woman linked to Ornella G. was also part of a suspected trio of women jihadists foiled by the authorities before they could carry out a fresh attack, investigators said.
Ornella G.'s fingerprints were found in a Peugeot car abandoned last Sunday a few hundred metres from Notre Dame with five gas cylinders and three bottles of diesel fuel inside, according to the probe.
Ornella G., who was on security service files for plans to get to Syria, was arrested in southern France on Tuesday with her partner, who was later released, investigators said.
Police on Thursday also arrested her alleged accomplice southeast of Paris -- Ines Madani, 19, the daughter of the owner of the car. Madani also allegedly pledged an oath to Islamic State.
The reason why the car was not detonated are unclear.
Investigators told AFP Ornella G. and Madani had apparently tried to set fire to the vehicle but "fled when they saw a man they believed to be a plainclothes policeman."
Two other women, aged 23 and 39, were arrested with Madani.
The trio had been plotting another attack, and were looking at train stations in Paris and south of the Paris, as well as the police, as potential targets, an unofficial source said.
Islamic State link 
They were guided by the IS in Syria, anti-terrorism prosecutor Francois Molins said on Friday.
"A terrorist cell made up of young women totally receptive to the deadly ideology of Daesh has been dismantled," Molins said at a news conference.
Meanwhile, Interior Minister Bernard Cazeneuve said on Saturday that police had arrested 293 people this year for "links to terrorist networks."
"This amounts to networks that have been dismantled and attacks that have been prevented," Cazeneuve said on a trip to Chateauroux, central France.
The minister did not give further details about the arrests.
"We are involved in an extremely intense, round-the-clock mission to protect the French public, and we are getting results," Cazeneuve said.
Security is one of the hot issues in early campaigning for next year's presidential elections.
A total of 238 people in France have been killed and hundreds wounded since January 2015 in a string of attacks attributed to, or fomented by, the IS.
Cazeneuve added that 17 foreigners had been expelled since the start of the year for posing a "serious threat to public order."
The latest was a Russian national, Mansur Kudusov, who was expelled to Russia on Friday after being jailed for for breaching house arrest, he said.
Kudusov's lawyer said he was a Chechen born in 1991 who had arrived in France as a child and had been placed under house arrest in 2012.