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Three missing after blast on Russian tanker in Sea of Azov

A Ukrainian navy gunboat is moored at the Port of Mariupol on the Azov Sea, eastern Ukraine on Dec. 2, 2018. Ukraine won a legal victory Saturday against Russia over last year's naval clash off the coast of Crimea, as a United Nations tribunal ordered Moscow to immediately release the ships and sailors it captured. (Genya Savilov/AFP/Getty Images/TNS)

This article was originally published by Radio Free Europe/Radio Liberty and is reprinted with permission.

Three crew members are missing after an explosion on a Russian tanker in the Sea of Azov, the Russian civil-defense authority has said.

The explosion on the oil tanker General Hazi Aslanov, sailing under the Russian flag from the Kavkaz port to Rostov-on-Don without cargo, occurred on October 24.

There were 13 crew on board. Ten of them were rescued.

The authority said on October 25 that seven vessels and more than 200 rescuers were taking part in the search operation, but there was no risk of oil leaking.

The ship, which was incapable of maneuvering, had been towed.

The cause of the blast is unclear.