Eighteen crew members were rescued after a second commercial vessel was hit by drones off Bulgaria early Tuesday.
The crew, made up of 11 Turkish and seven Indian nationals, were taken aboard the Bulgarian ferry Dioscuria. Two sailors were injured and are being taken to hospital in Varna, while the other 16 are being brought ashore.
Meanwhile, the crew of another cargo ship remains missing after the vessel sank in the attack. Rescuers found only an overturned lifeboat and life jackets at the scene.