Two teenagers were killed when the motorcycle they were riding on collided with a French police car. The motorcycle was unregistered and the teens were not wearing helmets. Of course, riots ensue:

The riots began Sunday night, after two teenagers on a motorcycle were killed in a collision with a police car in the town of Villiers-le-Bel, the Val d’Oise police prefecture reported late Monday. The melees come two years after riots in other Paris suburbs populated largely by immigrants and their French-born children. French President Nicolas Sarkozy, speaking in Beijing while on a visit to China, called for calm while an investigation in the crash is under way. Rioters set ablaze at least 60 cars, as well as a police station, library and car dealership in Villiers-le-Bel, police said. The clashes had spread across six towns by Monday night, they said. None of the injuries to police were life-threatening, police reported. The number of rioters hurt and the extent of their injuries was unknown. The 15- and 16-year-old boys killed in the Sunday evening wreck were both sons of African immigrants, police said. They died when their motorbike hit a patrol car in the town of Villiers-le-Bel, police said.