The captain of the Solong cargo ship who was arrested after crashing into an oil tanker off the English coast is a Russian national, the vessel’s owner said Wednesday, as maritime experts search for answers.

British police said Friday the Russian captain of a cargo ship that collided with a U.S. tanker has been charged over the death of a crew member, who is missing and presumed dead. Vladimir Motin, who was the master of the Portugal-flagged cargo vessel Solong,

The captain of a cargo ship that collided with an oil tanker in the North Sea has been charged with gross negligence manslaughter. The Portuguese-flagged Solong and US-registered tanker Stena Immaculate crashed off the East Yorkshire coast at about 10:00 GMT on Monday.