Most of the jet fuel onboard the U.S.-flagged tanker Stena Immaculate that was hit by a container ship in a collision off Britain's coast remains contained and only two of the vessel's 18 fuel tanks have leaked,

U.K. police have opened a criminal investigation into a collision between two ships in the North Sea and have arrested a man on suspicion of manslaughter.

A cargo ship hit a tanker carrying jet fuel for the U.S. military off eastern England on Monday, setting both vessels ablaze and sending fuel pouring into the North Sea. All 37 crew members aboard the vessels were safe and accounted for,