In a statement the prefecture recalled the "extreme seriousness" of last week's attacks, which left 130 people dead and prompted the government to put in place a three-month state of emergency.
Authorities have already banned two citizens' rallies planned around the climate summit that will be attended by 138 heads of state and government after the worst-ever terror attack on French soil.
The French government has said it will not "give in" to terrorism and insists the long-anticipated conference will go ahead.
It allows government to place under house arrest anyone considered to be a threat to security, and police to launch raids without advance authorisation from the courts.
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Hundreds of such raids have taken place this week, turning up weapons arsenals in people's homes - a rocket-launcher in one case - and the flag of the Islamic State group which claimed the attack.
While the state of emergency does not allow control of the press, the interior ministry reserves the right to block websites or social media accounts promoting terrorism.