At least three French cities, Amiens, Orleans and Savigny-sur-Orge have imposed overnight curfews to try and stop nearly two weeks of riots by mainly North African Muslim youths.
Authorities in the town of Amiens have also banned the sale of gasoline to teenagers in an apparent bid to halt the setting of fires by rioters.
A police spokesman says there is a marked decrease in violence since Monday night, but a number of violent incidents are still reported.
The French government Tuesday declared a state of emergency in riot-hit areas of the country, giving local governments the authority to impose curfews.
Prime Minister Dominique de Villepin has announced a number of measures to address what many French say are the main causes of the riots -- youth unemployment, poor schools and discrimination.