French President Emmanuel Macron convened his cabinet for a second crisis meeting in two days on Friday, after the most destructive night of nationwide rioting yet in protest at the fatal shooting of a teenager by police.
Hundreds of police were injured and hundreds of people arrested, authorities said, as rioters clashed with officers in towns and cities across France and buildings and vehicles were torched and stores looted.
Interior Minister Gerald Darmanin, who deployed 40,000 officers on Thursday night in a bid to quell a third night of unrest, said on Twitter that police made 667 arrests.
Nationwide, 249 police were injured, authorities said.
Macron, who has so far ruled out declaring a state of emergency, was due to fly back early from a European summit in Brussels to meet with his cabinet at 1100 GMT.
In a tweet, Prime Minister Elisabeth Borne called the violence "intolerable and inexcusable" and reaffirmed her support for police and firefighters who were "bravely carrying out their duties".
Some western governments had earlier warned their citizens in France to exercise caution.
Americans "should avoid mass gatherings and areas of significant police activity," the U.S. embassy said in a tweet on Thursday, while UK authorities urged Britons to monitor the media, avoid protests and check advice when travelling.
Videos on social media showed urban landscapes ablaze across the country. A tram was set alight in the eastern city of Lyon and 12 buses gutted in a depot in Aubervilliers, northern Paris.
Transport Minister Clement Beaune told RMC radio he did not rule out shutting down the capital's public transport network early on Friday.
FLASHPOINT NANTERRE
In Nanterre on the city's outskirts, protesters torched cars, barricaded streets and hurled projectiles at police following an earlier peaceful vigil held to pay tribute to the dead boy.
In the Chatelet Les Halles shopping mall in central Paris, a Nike shoe store was broken into, and several people were arrested after store windows were smashed along the adjacent Rue de Rivoli shopping street, Paris police said.
A source told Reuters that several Casino supermarkets were looted across the country.
Paris police said they had made 307 arrests in and around the city and that nine police and fire officers had been injured.
Nahel M.'s death has fuelled longstanding complaints of police violence and systemic racism inside law enforcement agencies from rights groups and within the low-income, racially mixed suburbs around France's major cities.
The policeman who prosecutors said had acknowledged firing a lethal shot at the teenager was on Thursday placed under formal investigation for voluntary homicide - equivalent to being charged under Anglo-Saxon jurisdictions. He is being held in preventive detention.
His lawyer, Laurent-Franck Lienard, said his client had aimed down towards the driver's leg but was bumped, causing him to shoot towards his chest. "Obviously (the officer) didn't want to kill the driver," Lienard said on BFM TV,
Overnight in southern France, police fired tear gas grenades and Marseille's tourist hot-spot of Le Vieux Port was evacuated as youths clashed with police. Police there said they had made 56 arrests and that 38 officers had been injured.
In Roubaix, in northern France, a fire destroyed the office of the TESSI company and several cars were set on fire.
The unrest has revived memories of riots in 2005 that convulsed France for three weeks and forced then-president Jacques Chirac to declare a state of emergency.
That wave of violence erupted in the Paris suburb of Clichy-sous-Bois and spread across the country following the death of two young men who ended up being electrocuted in a power substation as they hid from police.
