PARIS (Reuters) - The 18-year-old who beheaded a history teacher outside the school in France where he taught had approached pupils in the street and asked them to point out his victim, anti-terrorist prosecutor Jean-Francois Ricard said on Saturday. Speaking at a news conference, Ricard also said that the Russian-born attacker, after beheading the teacher, had posted a photograph of the teacher’s body on Twitter, accompanied by a message saying he had carried out the killing.