Weaknesses in the management of the EU’s external borders led to uncontrolled arrivals of irregular migrants in the EU and eventually to the reintroduction of internal borders between several Member States. The surge in terrorist and serious crime activities on EU territory has been linked to deficiencies in external border management and the EU information exchange architecture. For example, although the current version of the Schengen Information System has been operational since 2013, the number of security alerts and searches in the system were low before 2015 (see Figure 2).
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