French police arrested at least 33 people in a major pre-dawn operation north of Paris, targeting the suspected ringleaders of riots last year.
Up to 1,000 elite forces took part in the operation in and around Villiers-le-Bel, 20km north of the capital.
Police initially confirmed 17 arrests but later raised the number to 33.
Violence flared up in the area in late November after two teenagers died in a motorcycle crash with a police car.
During three nights of rioting, 119 police officers were injured, five of them seriously, according to justice ministry figures.
In December, police handed out leaflets in the area calling for witnesses to the shots fired.
The leaflets offered rewards of several thousand euro for information and said sources could remain anonymous.
President Nicolas Sarkozy said immediately after the riots that everything would be done to find those responsible for the attacks.
Tensions have run high in France's high-immigration suburbs since the country's worst civil unrest in decades in 2005.
