The 59-year-old man was arrested after a container ship struck an oil tanker in the North Sea on Monday. A crew member was presumed dead after an extensive search was called off.

An environmental group in the U.K. says the North Sea tanker collision could become a "disaster in really important protected areas."

Fears are mounting of a potential environmental disaster off the coast of Britain after a cargo ship carrying toxic chemicals smashed into an oil tanker transporting jet fuel for the US military.