Growing tensions between the ‘extreme Right and the Muslim world’ have pushed France to the ‘verge of a civil war’, the country’s most senior security chief has warned.Patrick Calvar, head of the General Directorate for Internal Security (DGSI) – France’s equivalent of MI5 – made his claim in the wake of last year’s terrorist attacks on Paris. A total of 147 people were murdered by terrorists in the capital during atrocities in January and November.Many of those responsible were French passport holders with North African backgrounds, leading to far-Right politicians calling for a massive clampdown on immigration.But Mr Calvar, 60, warned...