Paris — Authorities imposed curfews in the French Riviera cities of Nice and Cannes on Wednesday to prevent rioting, while the interior minister called for the deportation of foreigners convicted in the wave of unrest that has spread throughout France. Looters and vandals defied a state of emergency with attacks on superstores, a newspaper warehouse and a subway station. Arson attacks continued after sundown, with a nursery school going up in flames in the southern city of Toulouse, RTL radio reported. The unrest began Oct. 27 and has grown into a nationwide insurrection by disillusioned suburban youths who complain of...