Eight police have been injured in a second night of clashes between security forces and youths in the Paris suburb of Villiers-le-Bel.
A manslaughter inquiry was launched earlier today into the deaths there of two teenagers who were struck by a police vehicle yesterday.
The incident sparked a night of rioting in Villiers-le-Bel.
The two youths, aged 15 and 16, died after their motorcycle collided with a police car yesterday evening. The police officers abandoned their vehicle at the scene.
Six hours of clashes followed.
Gangs of youths shot at police, torched some 30 cars and looted shops and buildings. 25 police officers and one firefighter were injured in the violence.
Speaking on a trip to Beijing, French President Nicolas Sarkozy appealed for 'all sides to calm down' and said the judiciary should decide who bears responsibility.
A state prosecutor said an internal police investigation had been ordered for 'involuntary manslaughter and failure to assist persons in danger'.
Police said the bike smashed into the side of their car during a routine patrol. Neither youth was wearing a helmet.
Police and politicians warn the French suburbs remain a tinderbox two years after the 2005 riots, which exposed France's failure to integrate its large black and Arab populations.
The accidental death of two youths fleeing police sparked three weeks of nationwide riots in 2005, France's worst social unrest in decades.
President Nicolas Sarkozy remains widely reviled in the suburbs for his tough stance on law and order and immigration.
