On 16 December 2013, the Norwegian AIB (SHT) published a report of a supplementary investigation into a CFIT accident to a Wideroe DHC7 aircraft which occurred on a non precision approach to Brønnøysund Norway in IMC during a domestic flight in 1988 in which the aircraft was destroyed and all occupants killed. This report was made available in English translation on 24 January 2014. The purpose of the supplementary investigation reported, which was prompted by queries raised during 2013, was to investigate the chances that mobile phone use had affected aircraft systems in any way that might have contributed to the premature descent which had occurred. It was concluded that the presence and possible use of the mobile phones known to have been on board the aircraft had not led to interference from these devices which would have been capable of influencing the course of events.