Schengen, Ceuta’s special status and precedents for suspension
The Schengen Agreement, signed in 1985, establishes an area of free movement without internal border controls. To date, the Schengen Area covers an area of 4 million square kilometres and is home to more than 450 million people. Twenty-nine countries have acceded to the agreements: all EU Member States except Ireland and Cyprus, as well as Iceland, Liechtenstein, Norway and Switzerland. The Agreement provides that, in exceptional cases, Member States may temporarily reintroduce border controls, in whole or in part, at their internal borders.
How the suspension works
Under the agreement, the reintroduction of border controls is a measure that must be adopted as a last resort, in the event of a serious threat to public order or internal security. Although the decision rests with individual Member States, the European Commission may, in certain cases, have a say on the necessity and proportionality of the measure.
In the event of unforeseeable circumstances, a Member State may immediately reintroduce border controls without prior notice for a period of one month (which may not be extended beyond three months). However, the other Member States, the European Parliament, the Council and the European Commission must be informed.
In foreseeable circumstances, however, the duration of the reintroduction of border controls is limited to six months, and may be extended to a maximum of three years in exceptional circumstances.

