Paris ? Unrest spread across troubled suburbs around Paris in a sixth night of violence Tuesday as police clashed with angry youths and scores of vehicles were torched in at least nine towns, local officials said.

Police in riot gear fired rubber bullets at advancing gangs of youths in Aulnay-sous-Bois – one of the worst-hit suburbs – where 15 cars were burned, said the prefecture that runs the Seine-Saint-Denis region. Youths lobbed Molotov cocktails at an annex to the town hall and threw stones at the firehouse. It was not immediately clear whether there were injuries from the clashes.

Four people were arrested for throwing stones at police in nearby Bondy where 14 cars were burned, the prefecture said. A fire engulfed a carpet store, but it was not immediately clear whether the blaze was linked to the suburban unrest.

Officials gave an initial count of 69 vehicles torched in nine suburbs across the Seine-Saint-Denis region that arcs Paris on the north and northeast.

The area, home mainly to families of immigrant origin, often from Muslim North Africa, is marked by soaring unemployment and delinquency. Anger and despair thrive in the tall cinder-block towers and long “bars” that typically make up housing projects in France.