Friday's attacks paralysed French high-speed rail travel. Photo: JEAN-FRANCOIS MONIER / AFPSource: AFPFrance was on Monday probing the possible involvement of ultra-left movements in attacks that paralysed the rail network at the start of the Olympic Games, as new sabotage acts affected fibre optic cables in several areas. Photo: FRANCK FIFE / AFPSource: AFPInterior Minister Gerald Darmanin told France 2 television that the authorities were looking into the theory that "ultra-left" movements were behind the attacks. Photo: Denis CHARLET / AFP/FileSource: AFPIt is not yet clear if police are linking the sabotage attacks on the telecommunications and rail cables. A source close to the case told AFP nobody had yet said they were responsible for the telecoms sabotage.