French police launched dozens of raids overnight as part of a colossal manhunt in wake of Paris's deadly terror attacks.
Prime Minister Manuel Valls told the RTL radio more than 150 raids were carried out across the country.
"We are at war with terrorism," he told the station.
"The terrorists can strike again."
Interior Minister Bernard Cazeneuve said that 23 people had been arrested - while 104 others remained for questioning - over a 48-hour period.
He added that guns, bulletproof vests and even a rocket launcher had been seized.
"This is just the beginning," Cazeneuve said.
Three teams of terrorists laid siege to Paris on Friday night, killing 129 people in a spree of shootings and explosions across six locations.
The attackers were all outfitted with suicide vests and armed with Kalashnikovs.