EUROPE must rethink its open-border Schengen area, including a more robust protection of the zone's external frontiers, President Emmanuel Macron said on Thursday, after a spate of Islamist attacks in France and Austria. The tighter controls were needed to curb clandestine immigration, said Macron, adding that the criminal gangs illegally trafficking migrants into Europe were often linked to terror networks. "I am in favour of a deep overhaul of Schengen to re-think its organisation and to strengthen our common border security with a proper border force," Macron said during a visit to the Franco-Spanish border. The president said he would…