It is still unclear which substance has been released. The emissions, which extend into both the Swedish and Finnish economic zones, and are about 200 kilometers long with an area of 77 square kilometers.
– It is probably the largest emission we have had of a harmful substance that is not mineral oil, says Jonatan Tholin, who is the head of the preliminary investigation at the Coast Guard to P4 Gävleborg.
The spill was discovered on Wednesday.