0922 GMT July 15, 2018
Rioters set fire to cars and a medical center in the city on Tuesday night after news spread that an officer had shot dead the 22-year-old, named by local newspaper Ouest France as Bubakar, after stopping his car over an infraction, AFP wrote.
Youths clashed with police in the northwestern neighborhood of Breil where the killing took place, lobbing Molotov cocktails, before the unrest spread to two other poorer districts with a history of gang violence.
Burned-out cars littered the streets on Wednesday morning.
Interior Minister Gerard Collomb condemned the violence, adding that "all the necessary resources are being mobilized" to "calm the situation and prevent any further incidents".
Local Police Chief Jean-Christophe Bertrand said the youth had hit a policeman with his car, lightly injuring him, after a squad stopped the vehicle at around 8.30 p.m. for an alleged infraction and tried to take him to the police station for identification.
"One of his colleagues then fired, hitting the young man who unfortunately died," Bertrand told reporters.
He was hit in the carotid artery and declared dead on arrival at hospital, police sources said.
Judicial police and a national watchdog which investigates claims of police wrongdoing are investigating to clarify "the facts and determine in what circumstances the policeman used his weapon," said Pierre Sennes, public prosecutor for Nantes.
He said on Wednesday that the young man had been wanted by police in Creteil, near Paris, for robbery and other offences.
French police have a long history of strained relations with youths in poor, immigrant-heavy suburbs — not least since the death of two teenagers, electrocuted while hiding from officers, sparked nationwide riots in 2005.
The assault of a young black man by police — which led to officers being charged, including for rape sparked fresh unrest last year.
In January, the government vowed a crackdown on urban violence after shocking video footage emerged of a policewoman being beaten by a crowd of youths in the Paris suburbs on New Year's Eve.
Breil, the Nantes neighborhood where the young man was shot dead Tuesday, is a socially mixed district home to a large housing estate with a history of gang violence.