Thirteen seafarers have been kidnapped from a product tanker in what is thought to be the furthest offshore pirate attack in the Gulf of Guinea to date.

The seafarers, Ukrainians and Russians, were aboard the 11,322-dwt Curacao Trader (built 2007) and 452 km south of Conotou when eight armed men boarded the ship and took them prisoner, maritime security consultancy Dryad Global said on Friday.