Clichy-Sous-Bois, France - Police clashed with angry youths in a Paris suburb for the fourth straight night, police sources said, with accusations over the use of teargas in a mosque set to exacerbate the situation further.
Six police officers were slightly injured after being hit by projectiles, the sources said.
Eleven people were arrested after the violence in which eight cars and 16 rubbish bins were torched, departmental security spokesman Jean-Luc Sidot said.
There were no reports of any civilian casualties as the northeastern Paris suburb of Clichy-sous-Bois descended into violence once again.
The violence was originally triggered when two teenagers, aged 15 and 17, died by electrocution on Thursday after they scaled the wall of an electrical relay station and fell against a transformer.
The local public prosecutor said the boys wrongly thought they were being chased by police -- based on questioning of a 21-year-old man who was with them and survived the electrocution.
Police deny that the youths were being chased but an investigation has been opened by judicial and internal police authorities.
More serious clashes in the area on Thursday and Friday had pitted hundreds of youths against police, with 23 officers injured and 13 people taken into custody, as the burnt-out wrecks of dozens of cars lay smouldering on the streets.
Saturday night was calmer, although several cars were set alight and several arrests were made.
The situation in the area was calm again shortly after midnight on Monday.
Earlier in the evening, near the local mosque, "100 to 150 youths were looking for a fight," said Sidot.
One or more teargas cannisters were hurled inside the mosque, by an unknown source, according to the police and the local mayor's office.
It was "very probably not a police officer who launched the teargas cannister into the mosque, but there will be an enquiry," said Sidot.
However Muslim faithful inside the mosque accused the police of throwing the teargas into their place of worship.
Described by the main police union as "guerrilla" violence, the nights of rioting came a week after France's fiery interior minister, Nicolas Sarkozy, vowed to wage a "war without mercy" on crime in the suburbs of Paris.
Critics say Sarkozy's tough talk is feeding tensions between youths and the police while failing to cut crime in run-down suburbs, high-immigration areas facing chronic poverty, unemployment and a lack of prospects.
Following the initial rioting in Clichy-sous-Bois, Sarkozy said strong measures were needed to counter urban violence, and that he aimed to equip police cars with cameras and officers with "non-lethal weapons".
His critics accuse the interior minister, considered a leading contender in presidential elections scheduled for 2007, of pandering to the far-right with his tough rhetoric on crime.
During a highly-publicised visit on Tuesday to Argenteuil, a suburb northwest of the capital, Sarkozy was pelted with stones and bottles as he outlined a new government plan to root out crime from the neighbourhood.
A local human rights group has described Sarkozy's talk of "cleaning up" the suburbs as a "provocation" that helped explain the escalation of violence at the weekend.
The opposition Socialists' spokeswoman on security said "the violence is getting worse day by day", urging Sarkozy to work with teachers, local associations and politicians as well as police to improve the situation.
Hundreds of Clichy-sous-Bois residents held a peaceful march Saturday in tribute to the two dead teenagers, with groups of youths wearing tee-shirts marked "Dead for Nothing".
A lawyer representing the families of the victims said Sunday they intended to press civil charges for failure to assist a person in danger.
"Why did these young people, who had done nothing wrong, feel sufficiently threatened to enter a dangerous site, climb over a 2.5-metre (six foot) barbed-wire covered wall and hide inside a turbine?" asked the lawyer, Jean-Pierre Mignard.