The assailiants were found aboard speed boats wearing red headbands and chanting war songs similar to those associated with armed Ijaw militant groups.
Following their arrest, some claimed to be members of a Lagos-based cult unconnected with restive elements in the Niger Delta.
Last week militants were reported to have shut down an Agip pipeline in Bayelsa State, hitting 60,000 barrels of crude production from the Osiama oilfield in the Southern Ijaw Local Government Area that supplies volumes to the Brass export terminal.
Agip