From ISIS' statement:
And so eight brothers equipped with explosive belts and assault rifles attacked precisely chosen targets in the center of the capital of France. These targets included the Stade de France stadium during a soccer match - between the teams of Germany and France, both of which are crusader nations - attended by the imbecile of France (Francois Hollande). The targets included the Bataclan theatre for exhibitions, where hundreds of pagans gathered for a concert of prostitution and vice. There were also simultaneous attacks on other targets in the tenth, eleventh, and eighteenth districts, and elsewhere. Paris was thereby shaken beneath the crusaders' feet, who were constricted by its streets. The result of the attacks was the deaths of no less than two hundred crusaders and the wounding of even more. All praise, grace, and favor belong to Allah.
Allah blessed our brothers and granted them what they desired. They detonated their explosive belts in the masses of the disbelievers after finishing all their ammunition. We ask Allah to accept them amongst the martyrs and to allow us to follow them.
Its warning to France and the rest of the world:
Let France and all nations following its path know that they will continue to be at the top of the target list for the Islamic State and that the scent of death will not leave their nostrils as long as they partake in the crusader campaign, as long as they dare to curse our Prophet (blessings and peace be upon him), and as long as they boast about their war against Islam in France and their strikes against Muslims in the lands of the Caliphate with their jets, which were of no avail to them in the filthy streets and alleys of Paris. Indeed, this is just the beginning. It is also a warning for any who wish to take heed.