Nigeria, Togo and Benin each have their own forces to crack down on piracy, in contrast to the UN coordinated effort off Somalia.

Captian Pottengal Mukundan, director of the IBM, told the Wall Street Journal: "There's a real fear that the hijackings of these tankers will increase to an extent where it may not be controllable."

Three tankers have been attacked in West African waters during the past two weeks.

Torm’s