Europe faces a “nuclear bomb” of social unrest resulting from mass migration, the EU has warned.

Senior Eurocrat Corina Cretu predicted “ghettos” will spring up unless Brussels pours billions into integration.

Romanian Ms Cretu, who is the EU’s Commissioner for Regional Policy, warned: “If we allow ghettos or segregation of migrants, this will become a nuclear bomb in the future.

“Social integration will be crucial in the years to come.”