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.S.-based maritime management firm Crowley, which operates the Stena Immaculate, said the tanker “sustained a ruptured cargo tank containing Jet-A1 fuel,” when the container ship struck it, triggering a fire and “multiple explosions onboard,” with fuel released into the sea. It said all 23 mariners on the tanker were safe and accounted for.