Snipers anchor biggest security operation at France’s Six Nations opener

• Saturday’s Italy game first event at Stade de France since November attacks • Sniffer dogs, extra searches and 250 police also involved in clampdownSnipers, sniffer dogs and extra searches will anchor the biggest security operation seen at a sporting event in France when the national rugby team host Italy in their opening Six Nations game at the Stade de France on Saturday.This weekend’s match will be the first sporting event to be held at the national stadium in Paris since it was targeted by an Isis cell on 13 November as France hosted Germany in a football friendly. A passer-by was killed…