France's interior minister says the country will reinstate border controls for a month around a major U.N. climate conference in Paris.

Bernard Cazeneuve said on BFM television Friday that the controls are part of larger security measures around the Nov. 30-Dec. 11 conference.

Authorities are on alert for violent protesters as well as potential terror attacks. France faced deadly attacks by Islamic extremists in January and several other smaller attacks or attempted attacks so far this year.

The conference is aimed at reaching the most ambitious global accord to date for all world governments to reduce emissions that cause global warming.