Both Sweden and Denmark are signatories to the Schengen Agreement, which removes border and passport controls between two participant countries. However, in January 2016, during the European migrant crisis, Sweden was granted a temporary exemption under the terms of the Schengen Agreement in order to mandate that all travellers across the bridge had photographic proof of identity. As such, travellers into Sweden from Denmark (but not travellers into Denmark from Sweden) must show a valid passport or national ID card (citizens of EU/EEA countries) or passport and entry visa (if required) for nationals of other non-EU/EEA countries. The move marked a break with 60 years of passport-free travel between the Nordic countries.