Pirates have attacked Greek-owned tanker Kalamos leaving one person dead, as the ship anchored near a Nigerian Port.
Greek Government officials said the gunmen killed a Greek deputy captain of the ship and also took two Greeks and a Pakistani citizen hostage, BBC News reported.
According to media reports, the vessel was attacked while it was waiting to off-load at Qua Iboe oil terminal in south-eastern Nigeria.
Greece Deputy Shipping Minister Thodoris Dritsas was quoted by Reuters as saying: "The foreign and shipping ministries have taken the necessary actions for the rescue of the hostages."
Kalamos had 23 crewmembers onboard and was sailing under a Maltese flag. The remaining workers are safe.
International Maritime Bureau’s (IMB) annual piracy report stated that almost 245 incidents were recorded worldwide last year with 11 attacks carried out by Somali pirates.
The report recorded at least four ship crewmembers who were killed by pirates and 13 others injured, while nine people were kidnapped from their vessels during 2014.
However, it also indicated that piracy at sea has dropped 44% to its lowest level in eight years, since Somali piracy peaked in 2011.