The engine room of Russia’s SIG tanker near Crimea was damaged as a result of a sea drone attack, Russia’s Federal Agency for Marine and River Transport said early on Saturday.

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“The SIG tanker … received a hole in the engine room near the waterline on the starboard side, preliminarily as a result of a sea drone attack,” the agency said in a statement on its Telegram messaging app.

There were no casualties, it said.