Reuters informed this in a statement with reference to the coast guard and the local governor's office.
The Panama-flagged vessel, which departed from Russia's Azov port, sent out a distress signal around 148 kilometers off the northeastern Black Sea province of Samsun.
Thirteen crew members were on the bulk carrier including nine Ukraine nationals, two Azerbaijan nationals and two Russians, the Samsun governor's office said.
The coast guard said the distress signal was received regarding a "possible sinking" of the ship.
Seven members of the crew had been rescued so far while a search and rescue operation continued for the other four, the coast guard said.