In a previously undisclosed section of a videotape released on September 11, Ayman al-Zawahri also said that the group, the Salafist Group for Preaching And Combat, has officially joined the Al-Qaeda network.
Prime Minister Dominique de Villepin said France must remain "extremely vigilant."
Experts say the group has been severely weakened in recent months. Algeria is a former French colony.
(Reuters, AFP)