French police conducted 128 raids overnight following a wave of shootings and suicide bombings in Paris on Friday, which left at least 129 people dead, interior minister Bernard Cazeneuve said on Tuesday.
He told France Info radio station that police were making rapid progress in their investigation into the attacks claimed by Islamic State militants but declined to give further details.
France President Francois Hollande has declared a state of emergency allowing administrative arrests and searches without a warrant following the bloodiest attacks in French history.
In a sombre speech to both houses of parliament on Monday, Hollande said he would increase funds for national security, strengthen anti-terror laws and boost border controls.
“France is at war. But we’re not engaged in a war of civilisations, because these assassins do not represent any. We are in a war against jihadist terrorism which is threatening the whole world,” he told a packed chamber at the gilded Versailles Palace near Paris.
(With inputs from agencies)