The annual report charged Norwegian police with poor communication and poor use of information tied to terror investigations, according to Dagbladet.no and news bureau NTB.
The Norwegian anti-terrorism efforts are granted a short chapter in the report, produced annually by the US State Department.
The report noted that Norway's anti-terrorism law was put to the test last year, when four persons were arrested in connection with shots fired at an Oslo synagogue. The four were also suspected of having planned terrorist attacks against the US and Israeli embassies in Oslo.
New investigative methods were used, according to the report, but it criticized internal communication within the police and called for improvements in how information about terrorist suspects is handled.
The report also raised concerns that the anti-terrorism law limits the definition of conspiracy, which could weaken the law's effectiveness.
Iver Stensrud of the Oslo Police Districe told news bureau NTB that he wasn't aware of the report.
