Thousands of extra security forces are facing a second night of unrest in France after a 17-year-old driver was shot and killed by police near Paris on Tuesday during a traffic check.
The teenager, named as Nahel M, was shot at point-blank range as he drove off and crashed soon afterwards.
Paris police said they had contained "sporadic episodes" of fresh violence.
In Toulouse, protesters started a fire and threw stones at firefighters as they tried to put it out.
Demonstrators also clashed with police in the northern city of Lille.
In the western town of Rennes, about 300 people gathered to pay tribute to the teen - many of whom also lit fires and were dispersed by police to allow firefighters to put out the blazes, local media reported.
French President Emmanuel Macron said the shooting of Nahel was "unforgivable".
But his comments drew an angry reaction from police unions, who accused him of rushing to judge the officers involved.
The Alliance Police union called for them to be presumed innocent until found guilty, while the rival Unité SGP Police also spoke of political interventions that encouraged "anti-cop hatred".
Interior Minister Gérald Darmanin said he would be taking legal action against another group, France Police, after it published what he called an "unacceptable and abject" tweet seeking to justify the teenager's killing.
The now deleted tweet said "bravo" to the officers who "opened fire on a young criminal" and blamed the teen's parents for his death, claiming they had been "unable to educate their son".