According to reports the pirates are requesting a ransom for the Turkish Sailors who were sailing the Paksoy-1 from Cameroon to Ivory Coast when the pirates boarded the ship in the Gulf of Guinea.
Eight sailors were able to escape and the ship was not carrying freight. Turkey says it is working to secure the release of those seized.
The Gulf of Guinea is the most dangerous sea in the world for piracy, the International Maritime Bureau claims.
Ömer Çelik, spokesman for Turkey’s ruling AK Party, said the ministry was following the case closely and “working on it”.
Numan Paksoy, operations manager at Kadıoğlu Maritime, said about “12 pirates with heavy guns” had attacked the boat.
Crew members hid in a safe room – the citadel – when the pirates boarded the ship, but emerged after “the assailants threatened to burn the ship and kill all of them”, he told the BBC in an emailed statement.
The attackers then picked 10 sailors and let the other eight go, he added.
The International Maritime Bureau (IMB) said 73% of all sea kidnappings and 92% of hostage-takings occur in the Gulf of Guinea off Nigeria, Guinea, Togo, Benin and Cameroon.