"It is unusual for attacks to occur in this region and, in fact, there have been no reported attacks in the past five years," a statement from the ship operator Genel Denizcilik Nakliyati AS (Geden Line) said.
A senior official at V-Ships, a Turkish company which is the crew manager for the vessel, added that no contact has been established with the ship since the hijacking.
The 184-metre long MV Cotton with a gross tonnage of 23,248 tonnes was boarded by suspected pirates while awaiting berthing at Gabon's Gentil Port at 0453 hrs GMT on July 15.
"Geden Line believes the vessel was boarded by pirates at 04:53 UTC (coordinated universal time) on July 15, off the coast at Port Gentil in Gabon, where the vessel was due to load cargo," the statement from the ship operator added.
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It said that the company is in contact with the families of the crew members and appropriate authorities including the Turkish foreign ministry and the navy, as also the flag state (Malta) have been contacted.
Hijacking incidents are mainly reported from the Gulf of Aden on the east coast of Africa.