'We are in a situation of war', Jewish leader tells Hollande --- Refiling with transcription of further soundbites, amended intro --- 'We are in a situation of war', France's leading representative for the Jewish community tells Francois Hollande, demanding 'preventative measures' against Jihadists in France, such as provisional detention and electronic bracelets. He also criticizes social networks for 'contributing to hatred'. Images and soundbite.