President Francois Hollande vowed that France would wage "merciless" war on the Islamic State group, which claimed responsibility for the mayhem, as investigators raced to track down their accomplices and uncovered possible links to networks in Belgium and Syria.
Paris prosecutor Francois Molins said three groups of attackers, including seven suicide bombers, carried out the "act of barbarism" that shattered a Parisian Friday night.
Seven attackers launched gun attacks at Paris cafes, detonated suicide bombs near France's national stadium and killed hostages inside the concert venue during a show by an American rock band, an attack on the heart of the pulsing City of Light.
Ahsan Naeem, a 39-year-old filmmaker, said he's been to many of the places that were attacked Friday.
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"I've seen dozens of gigs at the Bataclan. Eaten at the Petit Cambodge. Sat outside Le Carillon on so many nights," said Naeem, who has lived in Paris for seven years. "All those places will have been full of my people. My friends. My acquaintances."
Adrien Chambel, a 27-year-old law student, said the crowd was much sparser than in January. "You feel that people are petrified," Chambel said.
Hollande, who declared three days of national mourning and raised the nation's security to its highest level, called the carnage "an act of war that was prepared, organised, planned from abroad with internal help."
The president said France would increase its military efforts to crush IS. He said France, which is part of a US-led coalition bombing suspected IS targets in Syria and Iraq and also has troops fighting Islamic militants in Africa, "will be merciless toward the barbarians of Islamic State group."