AMIENS (France): Months of tension between police and young people in a troubled district of northern France exploded on Tuesday, with dozens of youths facing off against riot officers in a night of violence. Seventeen officers were injured, a pre-school and public gym were torched, and at least three passing drivers in Amiens were dragged from their cars.

While the identity of the rioters and the immediate cause is unclear, the economic picture of the area in question is not. Unemployment skews higher in northern France and among the country's youth. Less than two weeks ago, the French government declared Amiens among 15 impoverished zones to receive more money and security.

The eruption of violence shows how little relations have changed between police and youths in France's housing projects since nationwide riots in 2005 raged unchecked for nearly a month, leaving entire neighbourhoods in flames in the far-flung suburbs.

At the height of the latest confrontation, 150 officers — both local and federal riot police — faced off against young men who fired buckshot and fireworks at them, skirmishing through the neighbourhood in the city about 75 miles north of Paris. There were no arrests.

''The confrontations were very, very violent,” Amiens Mayor Gilles Dumailly told the French television network BFM. Dumailly said tensions had been building for months between police and the impoverished residents, whom he described as “people who are in some difficulty.''

Anger was still running high when Interior Minister Manuel Valls arrived in the neighbourhood on Tuesday afternoon. A small group of people tried to push through Valls' security detail as he walked through the area, alternately booing him, cursing him and trying to speak to him.

One shouted out, “When are you going to speak to us?” before the minister ducked into a building to meet with the mayor, the head of the local prefecture and the mother and sister of a young man who had died in a motorcycle accident recently.

A standoff between people attending a memorial for the young man and police appears to have been one trigger of Tuesday's violence. Valls, however, underscored that police were in no way involved in his death. Valls, who used to represent an impoverished area outside of Paris in parliament, showed anger himself, expressing disbelief that police officers had been shot at during the recent unrest.

''Shooting a police officer? Burning a school? And then questioning these forces? It's intolerable,” he said at a news conference. “Nothing excuses shooting at police officers and burning public buildings.''

While he took a tough line in saying that order had to be restored, he added that the residents of the neighbourhood are the primary victims and said his door would always be open to them.

Relations between police and youth in housing projects have been troubled for years, perhaps decades. Riots occasionally erupt, often in the hot nights of August, when France's rich and middle classes head off for long vacations but poor and immigrant families in the projects stay home.

Alain Bauer, a professor of criminology, said circumstances had only worsened since 2005. He said it was hard to predict what would happen after the Amiens violence, which he described as “a culmination of bitterness and tension.''

''These are small events that stand apart unless they take on greater importance,” he said. “It will take an in-depth reaction (from the government), responding to both criminal and social problems.''

The riots usually follow a pattern: Police target a kid speeding on a motorbike or doing something suspicious; the kid speeds or runs away to escape and dies or gets seriously injured in flight. —AP