A video published by the media centre of the Islamic State group claims to show images and last statements of nine of the people who took part in the Paris attacks that killed 130 people on November 13.
The authenticity of the footage could not be independently verified.
The 17-minute video was uploaded to the IS channel on the Telegram app and shows some of the attackers wearing camouflage fatigues in a desert location, before the time of the Paris attacks.
Several of them are shown beheading hostages.
"These are the last messages of the nine lions of the caliphate who were mobilised from their lairs to make a whole country, France, get down on its knees," a narrator in the video says.
On the night of November 13 nine men, split into three groups, attacked a sports stadium, a string of cafes and a concert hall. An arrest warrant has been issued for another man, Salah Abdeslam, who fled to Belgium the following day.
The attackers are identified in the video by noms de guerre referring to their citizenship: three French, four Belgian and two Iraqis, referred to as Ali al-Iraqi and Ukashah al-Iraqi.
The two could be the suicide bombers who tried to attack the Stade de France stadium. They carried Syrian passports assumed to be forged and could not be formally identified. Seven other dead attackers have already been identified.
The video showed footage of British Prime Minister David Cameron expressing solidarity with the French people after the attacks, and concluded by flashing up a slogan on the screen saying: "Whoever stands in the ranks of kafir (infidels) will be a target for our swords."