Dryad Maritime says information on vessel movementsand cargoes must be restricted to those that need to know.

It argues that that insider information may be atthe heart of a several recent attacks involving cargo thefts in Southeast Asia.

Dryad said the recent hijacking of the Orapin 4 promptedit to issue the advisory to its shipping clients, on the basis that the crimefollows a pattern, which has seen up to six such attacks, over the last ninemonths.