Six of the 26 countries that make up part of the Schengen area - Denmark, France, Germany, Austria, Norway and Sweden - have reintroduced border controls.
In France, the controls were reintroduced after the terrorist attacks there; the other five countries implemented the change in order to face the high number of migrants. Schengen allows for the temporary reintroduction of border controls in the case of serious threat or fears for internal security.
Prior to the migratory wave, it was used in cases of sporting events at risk, summits of heads of state, and demonstrations. The European Commission believes that it should remain an exception, and should respect the principle of proportionality. But the decision is up to individual governments, and Brussels can only express its opinion, not veto a decision.
FRANCE: Controls were reintroduced last April 30 and are in effect through October 30, 2018 on all national borders, due to a "persistent terrorist threat", the European Commission said.
AUSTRIA. Reintroduced from May 12 through November 11, for "the security situation in Europe and threats from continuous and significant movements". Controls are underway at the borders with Hungary and Slovenia.
GERMANY. Also reintroduced from May 12 through November 11, due to "significant secondary movements", only on the border with Austria.
DENMARK. Following the same period and reasons as Germany and Austria. It sealed its land borders with Germany, as well as ports that connect it to German ports.
SWEDEN. Controls are in place from May 12 through November 11, for "continuous and serious threats to internal security".Controls are taking place at all internal borders.
- NORWAY. Controls authorised from May 12 through November 11, due to the "security situation in Europe, and secondary movements".All internal borders are closed, with an initial attention on sea connections with Denmark, Germany, and Sweden.