Aulnay-sous-Bois, France ? A week of riots in poor neighborhoods outside Paris gained dangerous new momentum Thursday, with youths shooting at police and firefighters and attacking trains and symbols of the French state.

Facing mounting criticism, Prime Minister Dominique de Villepin vowed to restore order as the violence that erupted Oct. 27 spread to at least 20 towns, highlighting the frustration simmering in housing projects that are home to many North African immigrants.

Unrest flared for an eighth straight night Thursday, though scaled down from previous says. Young men fire buckshot at riot police vehicles in Neuilly-sur-Marne, while a group of 30 to 40 harassed police near a synagogue further east in Stains, said the top official of Seine-Saint-Denis, Prefect Jean-Francois Cordet.

A special Interior Ministry operations center monitoring the violence said some 60 vehicles torched in the Seine-Saint-Denis region by early Friday and a total of 165 throughout the Paris metropolitan area. Some 60 vehicles were torched in the Val d’Oise area northwest of Paris.

The sporadic incidents were less intense that the ferocious rioting that erupted eight days ago in Clichy-sous-Bois and spread across the troubled area of housing projects marked by soaring unemployment, delinquency and a sense of despair.

“I will not accept organized gangs making the law in some neighborhoods. I will not accept having crime networks and drug trafficking profiting from disorder,” Villepin said at the Senate in between emergency meetings called over the riots.

Riots erupted in an outburst of anger in Clichy-sous-Bois over the accidental electrocution Oct. 27 of two teenagers who fled a soccer game and hid in a power substation when they saw police enter the area. Youths in the neighborhood suspect that police chased Traore Bouna, 15, and Zyed Benna, 17, to their deaths.

Since then riots have swelled into a broader challenge against the French state and its security forces. The Interior Ministry released a preliminary report Thursday exonerating officers of any direct role in the teenagers’ deaths.