The Division for Investigation of Maritime Accidents of the Danish Maritime Authority (DMA) notified the Accident Investigation Board Norway (AIBN) and the Malta Maritime Authority (MMA1
On Monday 6 July all parties agreed that a joint investigation should be launched with Norway as lead investigating state and Denmark and Malta as substantially interested states. It was also decided that the investigation should be carried out pursuant to Chapter 18 of the Norwegian Maritime Code and the International Maritime Organization’s guidelines for conducting marine accident investigations.
) of the accident. The DMA immediately started investigations on board both vessels. During the evening of 3 July, it was agreed by Denmark as coastal state and Norway and Malta as flag states that the flag states should start investigations on board their respective ships. The vessels and their operators were informed, and representatives of AIBN and MMA went on board Sundstraum and Kapitan Lus on Saturday, 4 July 2009.