* Components of improvised explosives found in garage
* Incident revives fears of France's large Jewish community
* Security to be boosted at synagogues
(Edits, adding context)
PARIS, Oct 10 (Reuters) - French authorities said on
Wednesday they had rooted out an "extremely dangerous terror
network" after uncovering weapons and bomb-making materials in
their investigation of suspected radical Islamists detained at
Paris prosecutor Francois Molins said a dozen people
arrested on Saturday would be held for a further 24 hours after
chemicals used to make explosives were found at a garage in the
Paris suburbs belonging to one of them.
The raids were triggered by a grenade attack on a kosher
grocery store outside Paris last month, and have further
unsettled Europe's largest Jewish community, which was shaken
when an al Qaeda-inspired gunman shot dead three Jewish children
and a rabbi in Toulouse in March.
"We are clearly confronted with an extremely dangerous
terror network," Molins said in a statement to the media. "It is
essential to extend their stay in custody."
Investigators carried out overnight searches of garages in
Torcy, a town in the eastern suburbs of Paris, after Saturday's
raid ended with police shooting dead an Islamist suspect linked
to the grenade attack and arresting 11 others.
Another suspect was subsequently arrested, bringing the
total to 12.
Police on Saturday found a list of local Jewish groups at
the home of one of the suspects. Molins said a search of the
suspect's garage had revealed a shotgun, a revolver, bags of
potassium nitrate, sulphur and a pressure cooker.
"These are all products used to make what we call improvised
explosives," he said.
JEWS ON EDGE
While Britain and Spain have suffered coordinated Islamist
militant attacks on their capitals in the last 10 years, France
had not seen an attack with mass casualties on its soil since
1995, when an Algerian Islamist group bombed the underground
Metro network and other sites in the capital.
Molins said the detention of the dozen suspects could be
extended by a further six days if necessary.
France's Jewish community has been on edge after a series of
attacks in recent months. In the worst incident, 23-year-old
Mohamed Merah, seemingly acting alone, killed three soldiers in
two separate attacks before shooting dead three children and a
rabbi outside a Jewish school in Toulouse.
Interior Minister Manuel Valls said there were several
hundred radical Islamists in France capable of acts of
terrorism, and that its prisons were breeding radicalism.
President Francois Hollande promised on Sunday to step up
security around synagogues and said the government would soon
present legislation to parliament that would allow police to
arrest people believed to have been involved in
terrorism-related activity outside France.
The Socialist government is taking a hard line on terrorism,
saying no act will be tolerated, as it tries to avoid a repeat
of the bloodshed in Toulouse.
The incident prompted authorities to raise the terrorism
alert in the Toulouse region to "scarlet", the highest level -
the first time this had been done in France.
That was later reduced to "red", where it had been since
coordinated attacks on the London transport system in 2005.
(Reporting by Catherine Bremer and Alexandria Sage; Editing by