Like Whittle intimated, when met with bricks, bottles, and stones, the French police should have come back with military grade weapons and slaughtered a few hundred of the savages. Maybe they'd learn.
But since I believe in sending them all back to their Islamic pestholes, it should not have come down to any dramatic action taken by the civilized people. Time to crack down hard on all European Muslims.
Jefferson had this problem with the Barbary pirates.