A French cop has been charged with homicide and is in custody over the killing of a young boy close to Paris on Tuesday.

The 17-year-old, named Nahel M, was shot at point-blank as he drove off and crashed soon afterward.

Anger at his killing has sparked violence across the country. A march led by the boy's mother was marred by clashes on Thursday afternoon.

In a third evening of unrest, protesters were arrested in Lille and Marseille.

In the town of Nanterre, where the teen was killed, a huge fire engulfed the ground floor of a building where a bank is located.

Video and pictures on social media likewise seem to show heaps of trash on fire in a few places.

Bus and tram services in Paris and the wider region stopped operating at 21:00 local time (19:00 GMT) in preparation for further violence. Some suburbs have declared night-time curfews.

Transport services have also been disrupted in the cities of Lille and Tours.

Some 40,000 police have been deployed across France in an attempt to deal with the unrest after cars and buildings were damaged in rioting in several French cities on Tuesday and Wednesday night.

Gérald Darmanin, the country's interior minister, said 170 officers were injured in Wednesday night's clashes alone and 180 people were arrested.

Officers were injured on Thursday afternoon as well, during violence in Nanterre that followed a largely peaceful march calling for justice. It was attended by more than 6,000 people.

Élisabeth Borne, the French prime minister, said she understood the outpouring of emotion following the 17-year-old's death, but condemned the riots.

"Nothing justifies the violence that's occurred," she said.

The teenager's death has sparked a wider conversation about the power of the police and the relationship between the authorities and those from France's suburbs, who feel segregated from the country's prosperous city centers.

"We have a law and judicial system that protects police officers and it creates a culture of impunity in France," Nahel's lawyer, Yassine Bouzrou, told the BBC World Service's Newshour program.

But Nahel's mother said she did not blame the police in general, or the system, for the killing - just the officer who fired the lethal shot that killed her son.

The officer accused of killing him said he had fired because he felt his life was in danger. His lawyer told French radio station RTL that his client discharged his firearm "in full compliance with the law".

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