PARIS (Reuters) -French investigators are preparing to go to Saudi Arabia soon as part of their investigation into incidents targeting French nationals that marred last month’s Dakar sports car rally, a source with knowledge of the matter told Reuters on Friday. French RMC radio said later that a mission including French DGSI secret service agents and an investigating magistrate would travel to Saudi Arabia, where the rally was held, as soon as Saturday for several days, citing sources close to the probe. “They will be welcomed by the Saudi authorities before a first briefing on Sunday”, RMC s…