He said the attacks on a stadium, concert hall and Paris cafe diners were "committed by a terrorist army, the Islamic State group, a jihadist army, against France, against the values that we defend everywhere in the world, against what we are: A free country that means something to the whole planet."
He said France "will be merciless toward the barbarians of Islamic State group." France "will act by all means anywhere, inside or outside the country."
France is already bombing IS targets in Syria and Iraq as part of the U.S.-led coalition, and has troops fighting extremists in Africa.
Related story
France's Hollande names Cazeneuve PM as Valls prepares election...
