France and Belgium want to improve intelligence sharing between the nine European nations most concerned with jihadist threats in the wake of the Paris attacks, AFP reports.

French Prime Minister Manuel Valls and his Belgian counterpart Charles Michel agreed to "launch an initiative" when they met at the UN climate summit in Paris on Monday, a source in the French premier's entourage said.

That would include harmonizing and systemizing how information on individuals deemed dangerous or radicalized is shared between countries in the 26-nation, passport-free Schengen zone, the source said.

France and Belgium want to see the "prolonging and expanding, while better formalizing, the multilateral exchange of information" between the countries, the source added.