British police have again extended the detention of the captain of a cargo ship which struck a tanker in the North Sea, citing the "complexities" of the case.

Salvage teams have boarded the two vessels involved in a crash that sparked a massive blaze in the North Sea, the UK coastguard said on Thursday. The crash triggered huge fires aboard the two ships, which required a massive high-seas firefighting effort to bring them under control.

LONDON (AP) — British police arrested a man on suspicion of manslaughter as they searched for answers about why a cargo ship hit a tanker transporting jet fuel for the U.S. military off eastern England, setting both vessels ablaze. One sailor was presumed dead.