DNK carried out tests with the system in 2010 for firefighters using self-contained breathing apparatus in structure fires , and found the system to be sufficient . Similar test were carried out by Oslo Fire Department later that year , and they found that the radio system was insufficient for their needs . Oslo Fire Department concluded that the DNK tests were only successful because of the use of additional directional gateway/repeater-radio equipment . Because of this firefighters in Oslo continued to use the old ultra-high frequency radios during indoor fires . Both the Norwegian Police Security Service 's bodyguard service and the service for protection of the royal family have opted to not use the new radio system , citing poor coverage indoors and while lying on the ground , even in downtown Oslo . The services have stated that this does not allow for interoperability with other agencies , which is a drawback in case of major incidents . Also the joint rescue coordination centers , the Norwegian Air Ambulance and the 330 Squadron which operates Westland Sea King search and rescue helicopters have opted out of using the system because of poor coverage . During the 2011 Norway attacks at Utøya , located in northern Buskerud , police officers from surrounding police districts were not able to communicate with local police because the area did not have coverage for the TETRA system
2011 Norway attacks
2011 Norway attacks
Norwegian Public Safety Network