European far right parties have called refugees streaming into the region "terrorists", a "ticking time bomb", a Muslim "invasion" that will bankrupt nations and undermine the continent's Christian roots.
France warned on Tuesday that it would be a mistake for Europe to take in all refugees persecuted by Islamic State militants in Syria and Iraq, and called for a plan of action to ensure the Middle East's diversity remained despite the mounting crisis.
At least 850,000 people are expected to cross the Mediterranean seeking refuge in Europe this year and next, the United Nations said on Tuesday, giving estimates that already look conservative.