By Phil Noble WITHERNSEA, England (Reuters) -Salvage crews headed to a damaged jet fuel tanker off the coast of England on Tuesday, a day after it was hit by a container ship in an unexplained collision that has raised concerns of an environmental disaster.

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.

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.