Seven Frenchmen arrested as part of a weekend swoop on a suspected Islamist terror cell believed to have plotted attacks in the country were formally charged Thursday, a legal source said, according to AFP.
The report said that an alleged leading member of the group, Jeremy Bailly, was the first to be charged and detained on suspicion of having organized a grenade attack on a Jewish grocery store in the Paris suburb of Sarcelles last month.
Earlier on Thursday, a French prosecutor branded the suspected homegrown group of Islamist extremists as the biggest terror threat the country has faced since the Algerian-based GIA carried out a string of deadly bombings in the 1990s.
Announcing charges of attempted murder and terrorism against seven out of 12 suspects arrested over the weekend, Paris prosecutor Francois Molins said they had been part of an active terror cell that was "probably the most dangerous in France since 1996."
The group had been plotting to mount attacks in France and to join up with other "jihadists" in Syria and elsewhere, Molins said, according to AFP. The profile of the suspects in custody was "much more dangerous than we initially assumed", he added.
"We have been able to avoid a terrorist attack in our country," Molins said.
Later Thursday, French President Francois Hollande vowed to track down and destroy Islamist extremist cells operating inside the country.
"We will go after them and we will eliminate them," he was quoted by AFP as having told French broadcasters.
The grenade attack on a Jewish grocery store in Sarcelles left one person slightly injured, but Molins said the grenade could have seriously injured anyone within a 10-meter radius.
Police have since discovered weapons and significant amounts of bomb-making equipment at the home of Bailly, AFP reported. He has admitted attempting to fabricate a bomb but has refused to say whether anyone else was involved or what his potential target was.
Five of the 12 initially detained were released without charge on Thursday. The other seven are all French citizens, aged between 19 and 25, Molins said. All but one of them are converts to Islam.
One alleged leading member of the group, 33-year-old Jeremie Louis-Sidney, was shot dead after on Saturday he opened fire on officers seeking to arrest him in a dawn raid at his home in Strasbourg.
Hours after Louis-Sidney was killed, blanks were fired towards a synagogue in the Paris suburb of Argenteuil. Hollande has promised French Jews he would ensure tighter security on Jewish institutions in the country, in the wake of the latest incidents.
Official data released this week revealed that there has been an increase of 45% in the number of anti-Semitic incidents in France over the past year.