The Swedish Security Service: Unchanged terror threat level in Sweden
The scale for terrorist threats has five levels in Sweden: no identified threat (1), low threat (2), elevated threat (3), high threat (4) and very high threat (5).
NCT is a working group consisting of personnel from the National Defence Radio Establishment (FRA), the Military Intelligence and Security Directorate (MUST) and the Swedish Security Service.
The Swedish Security Service about NCT's assessment (in Swedish) - Deleted link