Claude Gueant says that the attacker "was wearing on his bloody chest a kind of filming apparatus." Asked whether the gunman recorded the scene, Gueant responded, "We can imagine that."
He said Tuesday authorities are combing the Internet to see if the killer posted a video online, but have not yet found any traces.
Gueant was speaking in the city of Toulouse, where an unidentified assailant opened fire at a Jewish school Monday, killing a rabbi and his two sons and the daughter of the school principal.
Authorities say the same weapon was used in killings of three French paratroopers last week. Read More