… dozens of youths went on a rampage, setting the police station in Villiers-le-Bel on fire, ransacking the Arnouville police station and torching two petrol stations …

Why another rampage in Paris? For no good reason:

… Clashes broke out on Sunday night after two teenagers - aged 15 and 16 - were killed when the motorcycle they were driving collided with a police car.

Police sources said the two were riding a stolen mini-motorcycle, and that neither was wearing a helmet.

The police car was on a routine patrol and the teenagers were not being chased by police at the time of the accident, police said. The collision wrecked the front of the car and smashed the windscreen. …