Six Turkish crewmembers working on the Puli chemical tanker were kidnapped by pirates off the coast of Nigeria on Monday.
The incident took place in the early hours of Monday morning, 90 miles from shore. The Nigerian navy has boarded the attacked ship to interview the remaining crew.
Last month, Nigeria and Equatorial Guinea agreed to establish combined patrols to bolster security in the Gulf of Guinea, a region that has become the global hotspot for piracy in the last 12 months.
The ship attacked this time belongs to Istanbul-headquarted Kaptanoglu Group.
